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Jin Y, Jin Z, Sun D, Peng Y, Zhao Q, He Y, Li J, Zhang Y, Cui Y. Preparation of spirodiclofen monoclonal antibody and establishment of indirect competitive enzyme-linked immunosorbent assay. Food Chem 2023; 417:135936. [PMID: 36934705 DOI: 10.1016/j.foodchem.2023.135936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/09/2023] [Accepted: 03/09/2023] [Indexed: 03/16/2023]
Abstract
Spirodiclofen, a spirocyclic tetronic acid derivative, has excellent acaricidal effect and is used worldwide to control the majority of important mite species. For monitoring its residue in food and environmental samples, two haptens containing different spacer arms were synthesized, a monoclonal antibody (mAb 5A4) against spirodiclofen was prepared, and a heterologous indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) was established. The 50% inhibition concentration (IC50) of ic-ELISA was 25.46 ng/mL, and the working range was 5.59-133.85 ng/mL. The ic-ELISA showed no cross-reactivity with structural analogs of spirodiclofen and other commonly-used acaricides. The average recoveries from Shiranui citrus samples and Yangtze River water were 85.62%-97.74% and 85.95%-99.30%, respectively. In the analysis of 12 citrus samples, the results of the ic-ELISA were quite similar to those of ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Hence, the new immunosorbent assay provides a substitute method for the qualitative and quantitative of spirodiclofen in food and environmental samples.
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Affiliation(s)
- Yaqi Jin
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Zihui Jin
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Di Sun
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yilin Peng
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Qiyang Zhao
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yue He
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Jing Li
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yaohai Zhang
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yongliang Cui
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China.
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Cheng LY, Hou DY, Sun QZ, Yu SJ, Li SC, Liu HQ, Cong L, Ran C. Biochemical and Molecular Analysis of Field Resistance to Spirodiclofen in Panonychus citri (McGregor). INSECTS 2022; 13:1011. [PMID: 36354837 PMCID: PMC9696244 DOI: 10.3390/insects13111011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 10/24/2022] [Accepted: 10/31/2022] [Indexed: 06/16/2023]
Abstract
Spirodiclofen is one of the most widely used acaricides in China. The citrus red mite, Panonychus citri (McGregor) (Acari: Tetranychidae), is one of the most destructive citrus pests worldwide and has developed a high resistance to spirodiclofen. However, the molecular mechanism of spirodiclofen resistance in P. citri is still unknown. In this study, we identified a field spirodiclofen-resistant strain (DL-SC) that showed 712-fold resistance to spirodiclofen by egg bioassay compared to the susceptible strain. Target-site resistance was not detected as non-synonymous mutations were not found by amplification and sequencing of the ACCase gene of resistant and susceptible strains; in addition, the mRNA expression levels of ACCase were similar in both resistant and susceptible strains. The activity of detoxifying enzymes P450s and CCEs in the resistant strain was significantly higher than in the susceptible strain. The transcriptome expression data showed 19 xenobiotic metabolisms genes that were upregulated. Stage-specific expression profiling revealed that the most prominent upregulated gene, CYP385C10, in transcriptome data was significantly higher in resistant strains in all stages. Furthermore, functional analysis by RNAi indicated that the mortality caused by spirodiclofen was significantly increased by silencing the P450 gene CYP385C10. The current results suggest that overexpression of the P450 gene, CYP385C10, may be involved in spirodiclofen resistance in P. citri.
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Affiliation(s)
- Lu-Yan Cheng
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing 400712, China
| | - Dong-Yuan Hou
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing 400712, China
| | - Qin-Zhe Sun
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Shi-Jiang Yu
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing 400712, China
| | - Si-Chen Li
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing 400712, China
| | - Hao-Qiang Liu
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing 400712, China
| | - Lin Cong
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing 400712, China
| | - Chun Ran
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing 400712, China
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3
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Bahreini R, Nasr M, Docherty C, Muirhead S, de Herdt O, Feindel D. Miticidal activity of fenazaquin and fenpyroximate against Varroa destructor, an ectoparasite of Apis mellifera. PEST MANAGEMENT SCIENCE 2022; 78:1686-1697. [PMID: 34994089 PMCID: PMC9303763 DOI: 10.1002/ps.6788] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 12/09/2021] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND The Varroa mite (Varroa destructor) is an ectoparasite that can affect the health of honey bees (Apis mellifera) and contributes to the loss of colony productivity. The limited availability of Varroacides with different modes of action in Canada has resulted in the development of chemical resistance in mite populations. Therefore, an urgent need to evaluate new potential miticides that are safe for bees and exhibit high efficacy against Varroa exists. In this study, the acute contact toxicity of 26 active ingredients (19 chemical classes), already available on the market, was evaluated on V. destructor and A. mellifera under laboratory conditions using an apiarium bioassay. In this assay, groups of Varroa-infested worker bees were exposed to different dilutions of candidate compounds. In semi-field trials, Varroa-infested honey bees were randomly treated with four vetted candidate compounds from the apiarium assay in mini-colonies. RESULTS Among tested compounds, fenazaquin (quinazoline class) and fenpyroximate (pyrazole class) had higher mite mortality and lower bee mortality over a 24 h exposure period in apiariums. These two compounds, plus spirotetramat and spirodiclofen, were selected for semi-field evaluation based on the findings of the apiarium bioassay trials and previous laboratory studies. Consistent with the apiarium bioassay, semi-field results showed fenazaquin and fenpyroximate had high efficacy (>80%), reducing Varroa abundance by 80% and 68%, respectively. CONCLUSION These findings suggest that fenazaquin would be an effective Varroacide, along with fenpyroximate, which was previously registered for in-hive use as Hivastan. Both compounds have the potential to provide beekeepers with an alternative option for managing Varroa mites in honey bee colonies. © 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Rassol Bahreini
- Plant and Bee Health Surveillance SectionAlberta Agriculture and ForestryEdmontonABCanada
| | - Medhat Nasr
- Plant and Bee Health Surveillance SectionAlberta Agriculture and ForestryEdmontonABCanada
| | - Cassandra Docherty
- Plant and Bee Health Surveillance SectionAlberta Agriculture and ForestryEdmontonABCanada
| | - Samantha Muirhead
- Plant and Bee Health Surveillance SectionAlberta Agriculture and ForestryEdmontonABCanada
| | - Olivia de Herdt
- Plant and Bee Health Surveillance SectionAlberta Agriculture and ForestryEdmontonABCanada
| | - David Feindel
- Plant and Bee Health Surveillance SectionAlberta Agriculture and ForestryEdmontonABCanada
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M Rocha C, F Della Vechia J, J Savi P, Omoto C, J Andrade D. Resistance to spirodiclofen in Brevipalpus yothersi (Acari: Tenuipalpidae) from Brazilian citrus groves: detection, monitoring, and population performance. PEST MANAGEMENT SCIENCE 2021; 77:3099-3106. [PMID: 33638260 DOI: 10.1002/ps.6341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 02/05/2021] [Accepted: 02/26/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Brevipalpus yothersi mite is the main vector of Citrus leprosis virus (CiLV), the causal agent of citrus leprosis disease. The acaricide spirodiclofen has been widely used to control this mite. However, failures in control using spirodiclofen have been frequently reported by citrus growers. In this study, we estimated the diagnostic concentration to monitor the resistance to spirodiclofen of B. yothersi populations collected in nine citrus groves in Brazil. We then selected the B. yothersi population that showed lowest mortality with the estimated diagnostic concentration of spirodiclofen to characterize the frequency of resistant individuals, as well as demographic and life table parameters. RESULTS Variability was higher between populations in terms of susceptibility to spirodiclofen. The frequency of resistant eggs between populations ranged from 0.7% to 85.8%. The resistance ratio of B. yothersi to spirodiclofen was low to moderate. Survival rates of the immature stage, total adult longevity, oviposition days, and female fecundity were lower in the resistant strain. Furthermore, net reproduction rate, intrinsic rate of increase, finite rate of increase, and mean length of a generation were also lower in the R strain. CONCLUSION Although variations in resistance to spirodiclofen were observed between populations, the resistance ratio was low to moderate. Such data can be useful in the development of resistance management strategies for B. yothersi in Brazilian citrus groves. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Claudiane M Rocha
- Department of Agricultural Sciences, São Paulo State University (UNESP) - College of Agricultural and Veterinary Sciences, São Paulo, Brazil
| | - Jaqueline F Della Vechia
- Department of Agricultural Sciences, São Paulo State University (UNESP) - College of Agricultural and Veterinary Sciences, São Paulo, Brazil
| | - Patrice J Savi
- Department of Agricultural Sciences, São Paulo State University (UNESP) - College of Agricultural and Veterinary Sciences, São Paulo, Brazil
| | - Celso Omoto
- Department of Entomology and Acarology, University of São Paulo (ESALQ/USP), São Paulo, Brazil
| | - Daniel J Andrade
- Department of Agricultural Sciences, São Paulo State University (UNESP) - College of Agricultural and Veterinary Sciences, São Paulo, Brazil
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Suzuki J, Ootaka A, Onoue S, Onoue M. Synthesis and acaricidal activity of phenylpiperazine derivatives. JOURNAL OF PESTICIDE SCIENCE 2021; 46:189-197. [PMID: 34135680 PMCID: PMC8175216 DOI: 10.1584/jpestics.d21-007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
We synthesized 33 new phenylpiperazine derivatives and assessed their acaricidal activity. These derivatives were synthesized through sequential reactions consisting of the sulfonylation of 2-substituted 4-methylaniline with chlorosulfonic acid, reduction with red phosphorus and iodine, alkylation by alkyl halide, cyclization with bis(2-chloroethyl)amine hydrochloride, and N-substitution reaction of phenylpiperazines with various reagents. All phenylpiperazines synthesized were evaluated for acaricidal activity and their structure-activity relationships discussed, it was found that 4-substituted 1-[2-fluoro-4-methyl-5-(2,2,2-trifluoroethylsulfanyl)phenyl]piperazine derivatives exhibited good acaricidal activity. Among them, 1-[2-fluoro-4-methyl-5-(2,2,2-trifluoroethylsulfanyl)phenyl]-4-(trifluoromethylsulfonyl) piperazine showed the highest level of activity against Tetranychus urticae and provided a high level of activity against Tetranychus kanzawai and Panonychus citri. In addition, studies on the effect at various stages of T. urticae exhibited that this compound showed good activity against both adults and eggs.
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Affiliation(s)
- Jun Suzuki
- Hokko Chemical Industry Co., Ltd., 2165 Toda, Atsugi, Kanagawa 243–0023, Japan
| | - Akihito Ootaka
- Hokko Chemical Industry Co., Ltd., 2165 Toda, Atsugi, Kanagawa 243–0023, Japan
| | - Shinji Onoue
- Hokko Chemical Industry Co., Ltd., 2165 Toda, Atsugi, Kanagawa 243–0023, Japan
| | - Miwa Onoue
- Hokko Chemical Industry Co., Ltd., 2165 Toda, Atsugi, Kanagawa 243–0023, Japan
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6
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Li S, Lv M, Li T, Hao M, Xu H. Spirodiclofen ether derivatives: semisynthesis, structural elucidation, and pesticidal activities against Tetranychus cinnabarinus Boisduval, Aphis citricola Van der Goot and Mythimna separata Walker. PEST MANAGEMENT SCIENCE 2021; 77:2395-2402. [PMID: 33415823 DOI: 10.1002/ps.6267] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 12/23/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Spirodiclofen is a spirocyclic tetronic acid-type acaricidal agent. Nowadays, serious pests resistance to spirodiclofen and cross-resistance to other acaricides has appeared. To overcome pests resistance and discover new potential agrochemicals, a series of ether derivatives were prepared based on spirodiclofen as a lead compound. Their pesticidal activities were investigated against three typically agricultural pests, Mythimna separata Walker, Aphis citricola Van der Goot and Tetranychus cinnabarinus Boisduval. RESULTS Four steric structures of compounds 5e, 5f, 5i and 5j were determined by single-crystal X-ray diffraction. Against T. cinnabarinus, compounds 5b, 5f and 5l exhibited potent acaricidal activity, and their good control effects in the glasshouse were observed when compared with spirodiclofen, especially the control efficiency of compound 5b was comparable to that of spirodiclofen; against M. separata, compound 5j showed > 1.8-fold potent insecticidal activity of spirodiclofen; against A. citricola, compounds 5d and 5j displayed > 2.0-fold potent aphicidal activity of spirodiclofen. The relationships between their structures and agricultural activities were also discussed. CONCLUSION Compounds 5b and 5d could be further studied as acaricidal and aphicidal agents, respectively; compound 5j can be considered as a lead compound for the insecticidal and aphicidal activities. This will pave the way for future application of these derivatives as pesticide substitutes for spirodiclofen. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Shaochen Li
- College of Plant Protection, Northwest A&F University, Yangling, P. R. China
| | - Min Lv
- College of Plant Protection, Northwest A&F University, Yangling, P. R. China
| | - Tianze Li
- College of Plant Protection, Northwest A&F University, Yangling, P. R. China
| | - Meng Hao
- College of Plant Protection, Northwest A&F University, Yangling, P. R. China
| | - Hui Xu
- College of Plant Protection, Northwest A&F University, Yangling, P. R. China
- School of Marine Sciences, Ningbo University, Ningbo, P. R. China
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Margaritopoulos JT, Kati AN, Voudouris CC, Skouras PJ, Tsitsipis JA. Long-term studies on the evolution of resistance of Myzus persicae (Hemiptera: Aphididae) to insecticides in Greece. BULLETIN OF ENTOMOLOGICAL RESEARCH 2021; 111:1-16. [PMID: 32539892 DOI: 10.1017/s0007485320000334] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The aphid Myzus persicae s.l. (Hemiptera: Aphididae) is an important pest of many crops worldwide with a complex life cycle, intensely controlled by chemical pesticides, and has developed resistance to almost all used insecticides. In Greece, the aphid exhibits high genetic variation and adaptability and it is a classic example of evolution in the making. We have been studying M. persicae for over 20 years, on different host plants and varying geographical areas, analyzing its bio-ecology and the ability to develop resistance to insecticides. In this review, we present new and historical data on the effectiveness of insecticides from seven chemical groups used to control the aphid in Greece and the incidence of seven resistance mechanisms, including the new fast-spreading R81T point mutation of the postsynaptic nicotinic acetylcholine receptor. Thousands of samples were tested by biological, biochemical and molecular assays. The aphid populations were found to have developed and maintain resistance at medium to high levels to organophosphates, carbamates, pyrethroids and neonicotinoids for decades. In the latter group, a marked increase is recorded during an ~10-year period. The data analyzed and the extensive bibliography, advocate the difficulty to control the aphid making the design and application of IPM/IRM programs a challenge. We discuss principles and recommendations for the management of resistance, including the use of compounds such as flonicamid, spirotetramat, flupyradifurone and sulfoxaflor. We emphasize that resistance is a dynamic phenomenon, changing in time and space, requiring, therefore, continuous monitoring.
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Affiliation(s)
- John T Margaritopoulos
- Department of Plant Protection, Institute of Industrial and Fodder Crops, Hellenic Agricultural Organization-DEMETER, Volos, Greece
| | - A N Kati
- Plant Pathology Laboratory, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - C Ch Voudouris
- Department of Plant Protection, Institute of Industrial and Fodder Crops, Hellenic Agricultural Organization-DEMETER, Volos, Greece
| | - P J Skouras
- Laboratory of Agricultural Entomology and Zoology, Department of Agricultural Technologies, University of Peloponnese, Antikalamos, Greece
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Yaghoobi R, Khajehali J, Alavijeh ES, Nauen R, Dermauw W, Van Leeuwen T. Fenpyroximate resistance in Iranian populations of the European red mite Panonychus ulmi (Acari: Tetranychidae). EXPERIMENTAL & APPLIED ACAROLOGY 2021; 83:69-79. [PMID: 33165750 DOI: 10.1007/s10493-020-00569-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Accepted: 11/04/2020] [Indexed: 06/11/2023]
Abstract
The European red mite, Panonychus ulmi (Koch), is one of the most important apple orchard pests worldwide. Fenpyroximate, a mitochondrial electron transport inhibitor of complex I (METI-I), is a commonly used acaricide to control this pest. In this study, we determined fenpyroximate resistance levels for 11 P. ulmi populations from Iran and a spirodiclofen-resistant strain from Germany (PSR-TK). The LC50 values ranged between 121.8 and 5713.9 mg a.i. L-1 and the highest resistance ratio (RR) was 47-fold for the Padena population. PBO, TPP and DEM synergist ratios (SRs) were the highest for the PSR-TK (SR = 6.7), Shahin Dej (SR = 6.1) and Semirom3 (SR = 3.6) populations, respectively. In vitro enzyme activity measurements also showed that there was a higher glutathione S-transferases (GSTs) activity in the PSR-TK and Shahin Dej population compared to the most susceptible populations, whereas the esterase and P450 monooxygenase activity were not significantly higher in the resistant populations. Last, we screened all populations for the presence of two mutations previously associated with METI-I resistance in spider mites but none of these mutations could be detected. To conclude, moderate to high levels of fenpyroximate resistance were observed in P. ulmi populations from Iran, with increased detoxification most likely underlying fenpyroximate resistance.
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Affiliation(s)
- Razieh Yaghoobi
- Department of Plant Protection, College of Agriculture, Isfahan University of Technology, 8415683111, Isfahan, Iran
| | - Jahangir Khajehali
- Department of Plant Protection, College of Agriculture, Isfahan University of Technology, 8415683111, Isfahan, Iran.
| | - Elaheh Shafiei Alavijeh
- Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
| | - Ralf Nauen
- Crop Science Division, R&D, Pest Control, Bayer AG, Building 6260, Alfred Nobel Str. 50, 40789, Monheim, Germany
| | - Wannes Dermauw
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
| | - Thomas Van Leeuwen
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium.
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Dang M, Liu M, Huang L, Ou X, Long C, Liu X, Ren Y, Zhang P, Huang M, Liu A. Design, synthesis, and bioactivities of novel pyridazinone derivatives containing
2‐phenylthiazole
or oxazole skeletons. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.4118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mingming Dang
- Department of Resources and Environment Hunan Nonferrous Metals Vocational and Technical College Zhuzhou China
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
| | - Minhua Liu
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan Province Key Laboratory for Agrochemicals Changsha China
| | - Lu Huang
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan J & F Test Co., Ltd. Changsha China
| | - Xiaoming Ou
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan J & F Test Co., Ltd. Changsha China
| | - Chuyun Long
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan J & F Test Co., Ltd. Changsha China
| | - Xingping Liu
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan Province Key Laboratory for Agrochemicals Changsha China
| | - Yeguo Ren
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan Province Key Laboratory for Agrochemicals Changsha China
| | - Ping Zhang
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan J & F Test Co., Ltd. Changsha China
| | - Mingzhi Huang
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan Province Key Laboratory for Agrochemicals Changsha China
| | - Aiping Liu
- National Engineering Research Center for Agrochemicals Hunan Research Institute of Chemical Industry Changsha China
- Hunan Province Key Laboratory for Agrochemicals Changsha China
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Hao S, Cai Z, Cao Y, Du X. Design, Synthesis, and Acaricidal Activity of Phenyl Methoxyacrylates Containing 2-Alkenylthiopyrimidine. Molecules 2020; 25:molecules25153379. [PMID: 32722453 PMCID: PMC7435930 DOI: 10.3390/molecules25153379] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/21/2020] [Accepted: 07/24/2020] [Indexed: 11/16/2022] Open
Abstract
A series of novel phenyl methoxyacrylate derivatives containing a 2-alkenylthiopyrimidine substructure were designed, synthesized, and evaluated in terms of acaricidal activity. The structures of the title compounds were identified by 1H NMR, 13C NMR and high-resolution mass spectra (HRMS). Compound (E)-methyl 2-(2-((2-(3,3-dichloroallylthio)-6-(trifluoromethyl)pyrimidin-4-yloxy)methyl)phenyl)-3-methoxyacr-ylate (4j) exhibited significant acaricidal activity against Tetranychus cinnabarinus (T. cinnabarinus) in greenhouse tests possessing nearly twice the larvicidal and ovicidal activity compared to fluacrypyrim. Furthermore, the results of the field trials demonstrated that compound 4j could effectively control Panonychuscitri with long-lasting persistence and rapid action. The toxicology data in terms of LD50 value confirmed that compound 4j has a relatively low acute toxicity to mammals, birds, and honeybees.
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Affiliation(s)
- Shulin Hao
- Correspondence: (S.H.); (X.D.); Tel.: +86-571-88320430 (X.D.)
| | | | | | - Xiaohua Du
- Correspondence: (S.H.); (X.D.); Tel.: +86-571-88320430 (X.D.)
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Mehlhorn SG, Geibel S, Bucher G, Nauen R. Profiling of RNAi sensitivity after foliar dsRNA exposure in different European populations of Colorado potato beetle reveals a robust response with minor variability. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2020; 166:104569. [PMID: 32448424 DOI: 10.1016/j.pestbp.2020.104569] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/21/2020] [Accepted: 03/23/2020] [Indexed: 05/10/2023]
Abstract
In recent years, substantial effort was spent on the exploration and implementation of RNAi technology using double-stranded RNA (dsRNA) for pest management purposes. However, only few studies investigated the geographical variation in RNAi sensitivity present in field-collected populations of the targeted insect pest. In this baseline study, 2nd instar larvae of 14 different European populations of Colorado potato beetle (CPB), Leptinotarsa decemlineata, collected from nine different countries were exposed to a foliarly applied diagnostic dose of dsactin (dsact) to test for possible variations in RNAi response. Only minor variability in RNAi sensitivity was observed between populations. However, the time necessary to trigger a dsRNA-mediated phenotypic response varied significantly among populations, indicated by significant differences in mortality figures obtained five days after treatment. An inbred German laboratory reference strain D01 and a Spanish field strain E02 showed almost 100% mortality after foliar exposure to 30 ng dsactin (equal to 0.96 g/ha), whereas another Spanish strain E01 was least responsive and showed only 30% mortality. Calculated LD50-values for foliarly applied dsact against strains D01 (most sensitive) and E01 (least sensitive) were 9.22 and 68.7 ng/leaf disc, respectively. The variability was not based on target gene sequence divergence or knock-down efficiency. Variability in expression of the core RNAi machinery genes dicer (dcr2a) and argonaute (ago2a) was observed but did not correlate with sensitivity. Interestingly, RT-qPCR data collected for all strains revealed a strong correlation between the expression level of dcr2a and ago2a (r 0.93) as well as ago2a and stauC (r 0.94), a recently described dsRNA binding protein in Coleopterans. Overall, this study demonstrates that sensitivity of CPB to sprayable RNAi slightly varies between strains but also shows that foliar RNAi as a control method works against all tested CPB populations collected across a broad geographic range in Europe. Thus, underpinning the potential of RNAi-based CPB control as a promising component in integrated pest management (IPM) and resistance management programs.
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Affiliation(s)
- Sonja G Mehlhorn
- Department of Evolutionary Developmental Genetics, Göttingen Center for Molecular Biosciences, University of Göttingen, 37077 Göttingen, Germany; Bayer AG, Crop Science Division, R&D, Pest Control, Alfred-Nobel-Str. 50, 40789 Monheim, Germany
| | - Sven Geibel
- Bayer AG, Crop Science Division, R&D, Pest Control, Alfred-Nobel-Str. 50, 40789 Monheim, Germany
| | - Gregor Bucher
- Department of Evolutionary Developmental Genetics, Göttingen Center for Molecular Biosciences, University of Göttingen, 37077 Göttingen, Germany
| | - Ralf Nauen
- Bayer AG, Crop Science Division, R&D, Pest Control, Alfred-Nobel-Str. 50, 40789 Monheim, Germany.
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12
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Wei P, Demaeght P, De Schutter K, Grigoraki L, Labropoulou V, Riga M, Vontas J, Nauen R, Dermauw W, Van Leeuwen T. Overexpression of an alternative allele of carboxyl/choline esterase 4 (CCE04) of Tetranychus urticae is associated with high levels of resistance to the keto-enol acaricide spirodiclofen. PEST MANAGEMENT SCIENCE 2020; 76:1142-1153. [PMID: 31583806 DOI: 10.1002/ps.5627] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 08/01/2019] [Accepted: 09/24/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Spirodiclofen is an acaricide that targets lipid biosynthesis by inhibiting acetyl-coenzyme A carboxylase. Spirodiclofen resistance in spider mites has been previously documented and was associated with overexpression of CYP392E10, a cytochrome P450 mono-oxygenase that metabolizes spirodiclofen. However, additional mechanisms have been suggested in several studies and a carboxyl/choline esterase gene, CCE04, was shown to be overexpressed in two genetically different strains, SR-VP and SR-TK, both exhibiting high spirodiclofen resistance levels. RESULTS We identified two different CCE04 alleles in both resistant strains, CCE04SR-VP and CCE04London , with CCE04SR-VP being highly overexpressed. Isoelectric focusing analysis confirmed the overexpression of a single esterase isozyme, while copy number and random fragment length polymorphism analysis revealed that CCE04SR-VP overexpression was more likely due to selection for the CCE04SR-VP allele rather than gene amplification. Both CCE04 alleles were functionally expressed using the Pichia expression system. Functional enzyme assays revealed only limited kinetic differences between CCE04 isoforms for model substrates. In addition, inhibition/competition experiments with spirodiclofen suggested a similar interaction with both enzymes, whereas its active metabolite, spirodiclofen enol, did not inhibit enzyme activity. CONCLUSION Our study suggests that selection with spirodiclofen results in enrichment of a specific allele of CCE04 (CCE04SR-VP ) in two genetically independent strains, which is highly overexpressed. Based on kinetic enzyme data, however, quantitative rather than qualitative differences between CCE04SR-VP and CCE04London seem more likely to be involved in resistance. Our findings are discussed in the light of a possible spirodiclofen resistance mechanism, with sequestration of spirodiclofen by CCE04SR-VP being a likely hypothesis. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Peng Wei
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Peter Demaeght
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Kristof De Schutter
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Linda Grigoraki
- Molecular Entomology Lab, Institute of Molecular Biology and Biotechnology (IMBB), Foundation for Research and Technology (FORTH), Heraklion, Greece
- Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | - Vassiliki Labropoulou
- Insect Molecular Genetics and Biotechnology, Institute of Biosciences and Applications, National Centre for Scientific Research, Athens, Greece
| | - Maria Riga
- Molecular Entomology Lab, Institute of Molecular Biology and Biotechnology (IMBB), Foundation for Research and Technology (FORTH), Heraklion, Greece
| | - John Vontas
- Molecular Entomology Lab, Institute of Molecular Biology and Biotechnology (IMBB), Foundation for Research and Technology (FORTH), Heraklion, Greece
- Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | - Ralf Nauen
- Bayer AG, CropScience Division, R&D, Pest Control, Monheim, Germany
| | - Wannes Dermauw
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Thomas Van Leeuwen
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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13
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Bielza P, Moreno I, Belando A, Grávalos C, Izquierdo J, Nauen R. Spiromesifen and spirotetramat resistance in field populations of Bemisia tabaci Gennadius in Spain. PEST MANAGEMENT SCIENCE 2019; 75:45-52. [PMID: 30009510 DOI: 10.1002/ps.5144] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 07/12/2018] [Accepted: 07/12/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Spiromesifen and spirotetramat are novel insecticides belonging to the chemical class of tetronic and tetramic acid derivatives. Both compounds have proven very effective against field populations of Bemisia tabaci around the world. However, several growers have recently reported control failures in Spain. Therefore, we studied the resistance level to these insecticides in field populations reporting control failures. In addition, we further selected a spiromesifen-resistant strain to study the mechanisms involved and the cross-resistance pattern. RESULTS All the new field populations collected were significantly more resistant to spiromesifen than the susceptible population, confirming the presence of resistance. Several populations showing high levels of resistance to spiromesifen (>10 000-fold), exhibited cross-resistance to spirotetramat, but resistance ratios were much lower (130-fold). The spiromesifen laboratory-selected strain was very resistant to spiromesifen (LC50 > 30 000 mg L-1 ) and spirotetramat (LC50 = 368.1 mg L-1 ), but lacks any cross-resistance to other insecticides, thus providing options for resistance management. None of the synergists tested significantly restored the susceptibility of B. tabaci to either spiromesifen or spirotetramat. CONCLUSION This is the first report of resistance to spiromesifen and spirotetramat in B. tabaci, and such high levels of resistance have not been reported before in any field collected pest. Our results suggest that enhanced detoxification does not critically contribute to resistance to ketoenols in B. tabaci. The obvious lack of a metabolic resistance mechanism either suggests a target-site resistance mechanism or a metabolic mechanism insensitive to the synergists tested. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Pablo Bielza
- Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Cartagena, Spain
| | - Inmaculada Moreno
- Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Cartagena, Spain
| | - Ana Belando
- Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Cartagena, Spain
| | - Carolina Grávalos
- Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Cartagena, Spain
| | | | - Ralf Nauen
- Bayer AG, Crop Science Division, R&D, Pest Control, Monheim, Germany
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14
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Voudouris CC, Williamson MS, Skouras PJ, Kati AN, Sahinoglou AJ, Margaritopoulos JT. Evolution of imidacloprid resistance in Myzus persicae in Greece and susceptibility data for spirotetramat. PEST MANAGEMENT SCIENCE 2017; 73:1804-1812. [PMID: 28139069 DOI: 10.1002/ps.4539] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 01/15/2017] [Accepted: 01/25/2017] [Indexed: 06/06/2023]
Abstract
BACKGROUND Myzus persicae s.l. is a major crop pest globally and has evolved resistance to a range of insecticide classes making it increasingly difficult to control in some areas. Here we compare bioassay monitoring data for two important compounds, imidacloprid and spirotetramat, on field samples/clones collected in Greece. RESULTS A total of 122 aphid samples/clones from central and northern Greece were examined in dose-response bioassays with imidacloprid. There was an overall increase in the level of resistance (resistance factor = 15-40) within tobacco-collected samples from 78.7% in 2007 to 86.7% in 2015. The corresponding frequencies for peach samples were 13.3% and 6.7%. These results were confounded however by the first identification of the R81T target mutation in Greece during 2015 (4.3% as heterozygotes in peach) and 2016 (21.3% as heterozygotes in peach). No resistance to spirotetramat was found at the 60 clones collected in 2015. CONCLUSION Resistance to imidacloprid is continuing to increase within Greek M. persicae s.l. populations and the situation is likely to deteriorate further with the recent identification of the R81T resistance mutation. Resistance to spirotetramat has not been found and is therefore a good alternative to neonicotinoids for resistance management. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Costas Ch Voudouris
- Department of Biochemistry and Biotechnology, University of Thessaly, Larissa, Greece
- Department of Plant Protection, Institute of Industrial and Fodder Crops, Hellenic Agricultural Organization-DEMETER, Volos, Greece
| | - Martin S Williamson
- Department of Biological Chemistry and Crop Protection, Rothamsted Research, Harpenden, UK
| | - Panagiotis J Skouras
- Laboratory of Agricultural Entomology and Zoology, Department of Agricultural Technologies, Technological Educational Institute of Peloponnese, Antikalamos, Greece
| | - Amalia N Kati
- Plant Pathology Laboratory, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Anastasia J Sahinoglou
- Department of Plant Protection, Institute of Industrial and Fodder Crops, Hellenic Agricultural Organization-DEMETER, Volos, Greece
| | - John T Margaritopoulos
- Department of Biochemistry and Biotechnology, University of Thessaly, Larissa, Greece
- Department of Plant Protection, Institute of Industrial and Fodder Crops, Hellenic Agricultural Organization-DEMETER, Volos, Greece
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15
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Riga M, Bajda S, Themistokleous C, Papadaki S, Palzewicz M, Dermauw W, Vontas J, Leeuwen TV. The relative contribution of target-site mutations in complex acaricide resistant phenotypes as assessed by marker assisted backcrossing in Tetranychus urticae. Sci Rep 2017; 7:9202. [PMID: 28835683 PMCID: PMC5569037 DOI: 10.1038/s41598-017-09054-y] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 07/19/2017] [Indexed: 12/14/2022] Open
Abstract
The mechanisms underlying insecticide and acaricide resistance in insects and mites are often complex, including additive effects of target-site insensitivity, increased metabolism and transport. The extent to which target-site resistance mutations contribute to the resistance phenotype is, however, not well studied. Here, we used marker-assisted backcrossing to create 30 congenic lines carrying nine mutations (alone, or in combination in a few cases) associated with resistance to avermectins, pyrethroids, mite growth inhibitors and mitochondrial complex III inhibitors (QoI) in a polyphagous arthropod pest, the spider mite Tetranychus urticae. Toxicity tests revealed that mutations in the voltage-gated sodium channel, chitin synthase 1 and cytochrome b confer high levels of resistance and, when fixed in a population, these mutations alone can result in field failure of acaricide treatment. In contrast, although we confirmed the implication of mutations in glutamate-gated chloride channels in abamectin and milbemectin insensitivity, these mutations do not lead to the high resistance levels that are often reported in abamectin resistant strains of T. urticae. Overall, this study functionally validates reported target-site resistance mutations in T. urticae, by uncoupling them from additional mechanisms, allowing to finally investigate the strength of the conferred phenotype in vivo.
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Affiliation(s)
- Maria Riga
- Department of Biology, University of Crete, 70013, Heraklion, Crete, Greece.,Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, 700 13, Heraklion, Crete, Greece
| | - Sabina Bajda
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 9424, 1090 GE, Amsterdam, The Netherlands
| | | | - Stavrini Papadaki
- Department of Biology, University of Crete, 70013, Heraklion, Crete, Greece
| | - Maria Palzewicz
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 9424, 1090 GE, Amsterdam, The Netherlands
| | - Wannes Dermauw
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Coupure Links 653, Ghent University, B-9000, Ghent, Belgium
| | - John Vontas
- Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, 700 13, Heraklion, Crete, Greece.,Laboratory of Pesticide Science, Department of Crop Science, Agricultural University of Athens, 75 Iera Odos Street, 11855, Athens, Greece
| | - Thomas Van Leeuwen
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 9424, 1090 GE, Amsterdam, The Netherlands. .,Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Coupure Links 653, Ghent University, B-9000, Ghent, Belgium.
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16
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Yu H, Cheng Y, Xu M, Song Y, Luo Y, Li B. Synthesis, Acaricidal Activity, and Structure-Activity Relationships of Pyrazolyl Acrylonitrile Derivatives. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:9586-9591. [PMID: 27976890 DOI: 10.1021/acs.jafc.6b04221] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A series of novel pyrazolyl acrylonitrile derivatives was designed, targeting Tetranychus cinnabarinus, and synthesized. Their structures were identified by combination of 1H NMR, 13C NMR, and MS spectra. The structures of compounds 18 and 19 were further confirmed by X-ray diffraction. Extensive greenhouse bioassays indicated that compound 19 exhibits excellent acaricidal activity against all developmental stages of T. cinnabarinus, which is better than the commercialized compounds cyenopyrafen and spirodiclofen. It was shown that the acute toxicity of compounds 19 to mammals is quite low. The structure-activity relationships are also discussed.
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Affiliation(s)
- Haibo Yu
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Company Ltd. , Shenyang 110021, People's Republic of China
| | - Yan Cheng
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Company Ltd. , Shenyang 110021, People's Republic of China
| | - Man Xu
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Company Ltd. , Shenyang 110021, People's Republic of China
| | - Yuquan Song
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Company Ltd. , Shenyang 110021, People's Republic of China
| | - Yanmei Luo
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Company Ltd. , Shenyang 110021, People's Republic of China
| | - Bin Li
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Company Ltd. , Shenyang 110021, People's Republic of China
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17
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Peng T, Pan Y, Yang C, Gao X, Xi J, Wu Y, Huang X, Zhu E, Xin X, Zhan C, Shang Q. Over-expression of CYP6A2 is associated with spirotetramat resistance and cross-resistance in the resistant strain of Aphis gossypii Glover. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2016; 126:64-69. [PMID: 26778436 DOI: 10.1016/j.pestbp.2015.07.008] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 07/21/2015] [Accepted: 07/23/2015] [Indexed: 06/05/2023]
Abstract
A laboratory-selected spirotetramat-resistant strain (SR) of cotton aphid developed 579-fold and 15-fold resistance to spirotetramat in adult aphids and 3rd instar nymphs, respectively, compared with a susceptible strain (SS) [26]. The SR strain developed high-level cross-resistance to alpha-cypermethrin and bifenthrin and very low or no cross-resistance to the other tested insecticides. Synergist piperonyl butoxide (PBO) dramatically increased the toxicity of spirotetramat and alpha-cypermethrin in the resistant strain. RT-qPCR results demonstrated that the transcriptional levels of CYP6A2 increased significantly in the SR strain compared with the SS strain, which was consistent with the transcriptome results [30]. The depletion of CYP6A2 transcripts by RNAi also significantly increased the sensitivity of the resistant aphid to spirotetramat and alpha-cypermethrin. These results indicate the possible involvement of CYP6A2 in spirotetramat resistance and alpha-cypermethrin cross-resistance in the cotton aphid. These together with other cross-resistance results have implications for the successful implementation of resistance management strategies for Aphis gossypii.
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Affiliation(s)
- Tianfei Peng
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Yiou Pan
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Chen Yang
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Xiwu Gao
- Department of Entomology, China Agricultural University, Beijing 100193, PR China
| | - Jinghui Xi
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Yongqiang Wu
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Xiao Huang
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - E Zhu
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Xuecheng Xin
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Chao Zhan
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Qingli Shang
- College of Plant Science, Jilin University, Changchun 130062, PR China.
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18
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Bajda S, Dermauw W, Greenhalgh R, Nauen R, Tirry L, Clark RM, Van Leeuwen T. Transcriptome profiling of a spirodiclofen susceptible and resistant strain of the European red mite Panonychus ulmi using strand-specific RNA-seq. BMC Genomics 2015; 16:974. [PMID: 26581334 PMCID: PMC4652392 DOI: 10.1186/s12864-015-2157-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 10/27/2015] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND The European red mite, Panonychus ulmi, is among the most important mite pests in fruit orchards, where it is controlled primarily by acaricide application. However, the species rapidly develops pesticide resistance, and the elucidation of resistance mechanisms for P. ulmi has not kept pace with insects or with the closely related spider mite Tetranychus urticae. The main reason for this lack of knowledge has been the absence of genomic resources needed to investigate the molecular biology of resistance mechanisms. RESULTS Here, we provide a comprehensive strand-specific RNA-seq based transcriptome resource for P. ulmi derived from strains susceptible and resistant to the widely used acaricide spirodiclofen. From a de novo assembly of the P. ulmi transcriptome, we manually annotated detoxification enzyme families, target-sites of commonly used acaricides, and horizontally transferred genes implicated in plant-mite interactions and pesticide resistance. In a comparative analysis that incorporated sequences available for Panonychus citri, T. urticae, and insects, we identified radiations for detoxification gene families following the divergence of Panonychus and Tetranychus genera. Finally, we used the replicated RNA-seq data from the spirodiclofen susceptible and resistant strains to describe gene expression changes associated with resistance. A cytochrome P450 monooxygenase, as well as multiple carboxylcholinesterases, were differentially expressed between the susceptible and resistant strains, and provide a molecular entry point for understanding resistance to spirodiclofen, widely used to control P. ulmi populations. CONCLUSIONS The new genomic resources and data that we present in this study for P. ulmi will substantially facilitate molecular studies of underlying mechanisms involved in acaricide resistance.
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Affiliation(s)
- Sabina Bajda
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 9424, 1090, GE, Amsterdam, The Netherlands
| | - Wannes Dermauw
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium.
| | - Robert Greenhalgh
- Department of Biology, University of Utah, Salt Lake City, 257 South 1400 East, UT, 84112, USA
| | - Ralf Nauen
- Bayer CropScience AG, Research Pest Control, Alfred Nobel Str. 50, D-40789, Monheim, Germany
| | - Luc Tirry
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
| | - Richard M Clark
- Department of Biology, University of Utah, Salt Lake City, 257 South 1400 East, UT, 84112, USA.,Center for Cell and Genome Science, University of Utah, Salt Lake City, 257 South 1400 East, UT, 84112, USA
| | - Thomas Van Leeuwen
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 9424, 1090, GE, Amsterdam, The Netherlands. .,Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium.
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19
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Pan Y, Yang C, Gao X, Peng T, Bi R, Xi J, Xin X, Zhu E, Wu Y, Shang Q. Spirotetramat resistance adaption analysis of Aphis gossypii Glover by transcriptomic survey. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2015; 124:73-80. [PMID: 26453233 DOI: 10.1016/j.pestbp.2015.04.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 04/17/2015] [Accepted: 04/17/2015] [Indexed: 06/05/2023]
Abstract
A resistant strain of the cotton aphid (SR) developed 441.26-fold and 11.97-fold resistance to spirotetramat for adult aphids and nymphs, respectively, compared with the susceptible (SS) strain. Solexa sequencing technology was employed to identify differentially expressed genes (DEGs) in the spirotetramat-resistant cotton aphid. Respective totals of 22,430,522 and 21,317,732 clean reads were obtained from SR and SS cDNA libraries and assembled into 35,222 non-redundant (Nr) consensus sequences. A total of 14,913, 9,220, 7,922, 4,314 and 4,686 sequences were annotated using Nr, Swiss-Prot, Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) and Clusters of Orthologous Groups (COG), respectively. Compared with the SS strain, the SR strain had 1287 significantly changed unigenes, of which 130 genes were up-regulated and 1157 genes were down-regulated (P ≤ 0.001). Among these genes, 440 unigenes were annotated, consisting of 114 up-regulated and 326 down-regulated genes. The expression levels of heat shock protein 70 (Hsp70) and UDP-glucuronosyltransferase were significantly up-regulated in the SR strain compared to the SS strain. The genes encoding cuticle proteins, salivary glue protein, fibroin heavy chain, energy ATP synthase, and cytochrome c oxidase were dramatically decreased. Among the DEGs, cytochrome P450 6A2 (c20965.graph_c0) was the only P450 gene up-regulated in the SR strain. The expression levels of 10 DEGs were confirmed by real-time qPCR, and the trends in gene expression observed by qPCR matched those of the Solexa expression profiles. The acetyl-CoA carboxylase (ACC) genes in the SR and SS libraries both contain four single nucleotide polymorphisms (SNPs), with three common SNPs: 1227 (C/T), 1811 (A/T: F/Y) and 3759 (C/T); however, 7540 (A/T) and 108 (G/A) occurred solely in the SS and SR strains, respectively.
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Affiliation(s)
- Yiou Pan
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Chen Yang
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Xiwu Gao
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Tianfei Peng
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Rui Bi
- Department of Entomology, Jilin Agricultural University, Changchun 130118, China
| | - Jinghui Xi
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Xuecheng Xin
- College of Plant Science, Jilin University, Changchun 130062, China
| | - E Zhu
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Yongqiang Wu
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Qingli Shang
- College of Plant Science, Jilin University, Changchun 130062, China.
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Damos P, Colomar LAE, Ioriatti C. Integrated Fruit Production and Pest Management in Europe: The Apple Case Study and How Far We Are From the Original Concept? INSECTS 2015; 6:626-57. [PMID: 26463407 PMCID: PMC4598656 DOI: 10.3390/insects6030626] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 06/13/2015] [Accepted: 06/17/2015] [Indexed: 12/02/2022]
Abstract
This review focuses on the process of adapting the original concept of Integrated Pest Management (IPM) to the wider conception of the Integrated Fruit Production (IFP) implemented in Europe. Even though most of the pest management strategies still rely on the use of synthetic pesticides, a wide array of innovative and environmentally friendly tools are now available as possible alternative to the pesticides within the modern apple production system. We also highlight how recent pest management strategies and tools have created an opening for research towards IPM improvement, including the use of biorational pesticides, semiochemicals and biological control. Forecasting models, new tree training systems and innovative spray equipment have also been developed to improve treatment coverage, to mitigate pesticide drift and to reduce chemical residues on fruits. The possible threats that jeopardize the effective implementation of IPM and particularly the risks related to the development of the pesticide resistance and the introduction of new invasive pests are also reviewed. With the directive 128/09, the European legislation recognizes IPM as a strategic approach for the sustainable use of pesticides. Within this context, IPM and related guidelines is called to meet different areas of concern in relation to the worker and bystander safety. Beside the traditional economic criteria of the market-oriented agriculture, sustainable agriculture includes the assessment of the environmental impact of the agronomic practices within the societal context where they take place. As a consequence of the raising consumer concerns about environmental impacts generated by the fruit production, IFP certification over product standards, including process aspects, are frequently required by consumers and supermarket chains.
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Affiliation(s)
- Petros Damos
- Open University of Cyprus, Faculty of Pure and Applied Sciences, Department of Environmental Conservation and Management, Main OUC building: 33, Giannou Kranidioti Ave., 2220, Latsia, Nicosia, Cyprus.
| | - Lucía-Adriana Escudero Colomar
- IRTA, Sustainable Plant Protection (Entomology), IRTA-Mas Badia Agricultural Experimental Station. La Tallada d'Empordà S/N. 17134, Girona. Spain.
| | - Claudio Ioriatti
- Technology Transfer Centre, Fondazione Edmund Mach, Via Edmund Mach 1, 38010 San Michele all'Adige (TN), Italy.
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Van Leeuwen T, Tirry L, Yamamoto A, Nauen R, Dermauw W. The economic importance of acaricides in the control of phytophagous mites and an update on recent acaricide mode of action research. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2015; 121:12-21. [PMID: 26047107 DOI: 10.1016/j.pestbp.2014.12.009] [Citation(s) in RCA: 148] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 12/08/2014] [Accepted: 12/08/2014] [Indexed: 05/03/2023]
Abstract
Acaricides are one of the cornerstones of an efficient control program for phytophagous mites. An analysis of the global acaricide market reveals that spider mites such as Tetranychus urticae, Panonychus citri and Panonychus ulmi are by far the most economically important species, representing more than 80% of the market. Other relevant mite groups are false spider mites (mainly Brevipalpus), rust and gall mites and tarsonemid mites. Acaricides are most frequently used in vegetables and fruits (74% of the market), including grape vines and citrus. However, their use is increasing in major crops where spider mites are becoming more important, such as soybean, cotton and corn. As revealed by a detailed case study of the Japanese market, major shifts in acaricide use are partially driven by resistance development and the commercial availability of compounds with novel mode of action. The importance of the latter cannot be underestimated, although some compounds are successfully used for more than 30 years. A review of recent developments in mode of action research is presented, as such knowledge is important for devising resistance management programs. This includes spirocyclic keto-enols as inhibitors of acetyl-CoA carboxylase, the carbazate bifenazate as a mitochondrial complex III inhibitor, a novel class of complex II inhibitors, and the mite growth inhibitors hexythiazox, clofentezine and etoxazole that interact with chitin synthase I.
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Affiliation(s)
- Thomas Van Leeuwen
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 9424, 1090 GE Amsterdam, The Netherlands.
| | - Luc Tirry
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Coupure Links 653, Ghent University, B-9000 Ghent, Belgium
| | - Atsushi Yamamoto
- Research and Development Division, Nippon-soda Co., Ltd., 2-2-1 Ohtemach, Chiyoda-ku, Tokyo 100-8165, Japan
| | - Ralf Nauen
- Bayer CropScience AG, Research Pest Control, Alfred Nobel Str. 50, D-40789 Monheim, Germany
| | - Wannes Dermauw
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Coupure Links 653, Ghent University, B-9000 Ghent, Belgium
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22
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Shi L, Xu Z, Shen G, Song C, Wang Y, Peng J, Zhang J, He L. Expression characteristics of two novel cytochrome P450 genes involved in fenpropathrin resistance in Tetranychus cinnabarinus (Boisduval). PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2015; 119:33-41. [PMID: 25868814 DOI: 10.1016/j.pestbp.2015.02.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 01/24/2015] [Accepted: 02/24/2015] [Indexed: 06/04/2023]
Abstract
The carmine spider mite, Tetranychus cinnabarinus, which is also considered as the red form of Tetranychus urticae, is one of the most serious mite pests on crops. It is capable of rapidly developing resistance to acaricides, and has caused difficulty in controlling. However, the resistance mechanism of this mite remains unclear at molecular level. As a member of main detoxification enzymes, cytochrome P450 monooxygenases (CYPs or P450s) play important roles in the development of acaricide resistance in arthropods. In this study, two novel P450 genes (CYP389B1 and CYP392A26) were identified and characterized from T. cinnabarinus. The opening reading frames (ORFs) of CYP389B1 and CYP392A26 contained 1545 and 1488 nucleotides, which encode 514 and 495 amino acids, respectively. Phylogenetic analysis showed that CYP389B1 and CYP392A26 were most closely related to CYP389B1 and CYP392A4 from T. urticae, respectively. When treated with piperonyl butoxide (PBO), an inhibitor of P450s, the resistance ratio of fenpropathrin-resistant (FeR) strain decreased from 101- to 75-fold, which suggested a correlation between P450 and fenpropathrin-resistance in T. cinnabarinus. Furthermore, constitutive over-expressions of CYP389B1 and CYP392A26 were detected in FeR strain. Meanwhile, the expressions of CYP389B1 and CYP392A26 were inducible in FeR strain after treatment in 6, 12 and 24 h with LC30 of fenpropathrin; especially, the expression of CYP392A26 increased to a markedly high level (20.88-fold higher than in the control) after treatment in 6 h. However, there was no significant difference between treatment and control in susceptible strain. Furthermore, stage specific expression profiles of these two genes did not show significant difference among developing stages, except for eggs, in which the mRNA levels were quite low. The results indicate that CYP389B1 and CYP392A26 were involved in the fenpropathrin-resistance in T. cinnabarinus, and the expression of CYP392A26 was more sensitive to fenpropathrin stress. These findings provide clues for further elucidating the function and regulation mechanism of these two cytochrome P450 genes in T. cinnabarinus.
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Affiliation(s)
- Li Shi
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Zhifeng Xu
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Guangmao Shen
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Changgui Song
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Ying Wang
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Jianfang Peng
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Jiao Zhang
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Lin He
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400716, China.
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Sugimoto N, Osakabe M. Cross-resistance between cyenopyrafen and pyridaben in the twospotted spider mite Tetranychus urticae (Acari: Tetranychidae). PEST MANAGEMENT SCIENCE 2014; 70:1090-1096. [PMID: 24030907 DOI: 10.1002/ps.3652] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 08/10/2013] [Accepted: 09/12/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND Cyenopyrafen is an inhibitor of complex II of the mitochondrial electron transport chain. It has a molecular structure that shares some common features with frequently used complex I inhibitors such as pyridaben. To evaluate whether this similarity in structure poses a cross-resistance risk that might complicate resistance management, we selected for pyridaben and cyenopyrafen resistance in the laboratory and characterized resistance. RESULTS The selection for cyenopyrafen conferred cross-resistance to pyridaben and vice versa. Resistance towards these both acaricides was incompletely dominant in adult females. However, in eggs maternal effects were observed in pyridaben resistance, but not in the cyenopyrafen-resistance (completely dominant). In the cyenopyrafen resistant strain, the LC50 of eggs remained lower than the commercially recommended concentration. The common detoxification mechanisms by cytochrome P450 was involved in resistance to these acaricides. Carboxyl esterases were also involved in cyenopyrafen resistance as a major factor. CONCLUSIONS Although cross-resistance suggests that pyridaben resistance would confer cyenopyrafen cross-resistance, susceptibility in eggs functions to delay the development of cyenopyrafen resistance.
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Affiliation(s)
- Naoya Sugimoto
- Laboratory of Ecological Information, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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Khalighi M, Tirry L, Van Leeuwen T. Cross-resistance risk of the novel complex II inhibitors cyenopyrafen and cyflumetofen in resistant strains of the two-spotted spider mite Tetranychus urticae. PEST MANAGEMENT SCIENCE 2014; 70:365-368. [PMID: 23997025 DOI: 10.1002/ps.3641] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 08/21/2013] [Accepted: 08/30/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND Cyflumetofen and cyenopyrafen are novel acaricides acting as complex II inhibitors. This new mode of action is extremely useful for devising efficient resistance management strategies for mite control. The authors determined the cross-resistance risk of both compounds, using a collection of well-characterised resistant strains of Tetranychus urticae, and also selected for cyflumetofen resistance in the laboratory. RESULTS Cross-resistance to cyflumetofen and cyenopyrafen was detected in field strains, with LC50 values exceeding the registered field dose. Synergism experiments suggested that P450 monooxygenases are involved in resistance, and that the activation mechanism of the two compounds most likely differs. Laboratory selection with cyflumetofen resulted in a highly resistant T. urticae strain that displayed negative cross-resistance to cyenopyrafen. CONCLUSIONS The cross-resistance risk of cyflumetofen and cyenopyrafen documented in this study needs to be integrated in resistance management strategies, especially in regions or crops with a history of frequent acaricide applications, in order to safeguard the efficacy of these compounds with a valuable new mode of action.
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Affiliation(s)
- Mousaalreza Khalighi
- Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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25
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Demaeght P, Dermauw W, Tsakireli D, Khajehali J, Nauen R, Tirry L, Vontas J, Lümmen P, Van Leeuwen T. Molecular analysis of resistance to acaricidal spirocyclic tetronic acids in Tetranychus urticae: CYP392E10 metabolizes spirodiclofen, but not its corresponding enol. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2013; 43:544-554. [PMID: 23523619 DOI: 10.1016/j.ibmb.2013.03.007] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 03/05/2013] [Accepted: 03/06/2013] [Indexed: 06/02/2023]
Abstract
Spirodiclofen is one of the most recently developed acaricides and belongs to the new family of spirocyclic tetronic acids (ketoenols). This new acaricidal family is an important chemical tool in resistance management strategies providing sustainable control of spider mites such as Tetranychus urticae. Spirodiclofen targets lipid biosynthesis mediated by direct inhibition of acetyl coenzyme A carboxylase (ACCase). In this study, we investigated two genetically distant spider mite strains with high resistance to spirodiclofen. Despite the strong resistance levels to spirodiclofen (up to 680-fold), only limited cross-resistance with other members of this group such as spiromesifen and spirotetramat could be detected. Amplification and sequencing of the ACCase gene from resistant and susceptible strains did not reveal common non-synonymous mutations, and expression levels of ACCase were similar in both resistant and susceptible strains, indicating the absence of target-site resistance. Furthermore, we collected genome-wide expression data of susceptible and resistant T. urticae strains using microarray technology. Analysis of differentially expressed genes revealed a broad response, but within the overlap of two resistant strains, several cytochrome P450s were prominent. Quantitative PCR confirmed the constitutive over-expression of CYP392E7 and CYP392E10 in resistant strains, and CYP392E10 expression was highly induced by spirodiclofen. Furthermore, stage specific expression profiling revealed that expression levels were not significantly different between developing stages, but very low in eggs, matching the age-dependent resistance pattern previously observed. Functional expression of CYP392E7 and CYP392E10 confirmed that CYP392E10 (but not CYP392E7) metabolizes spirodiclofen by hydroxylation as identified by LC-MS/MS, and revealed cooperative substrate binding and a Km of 43 μM spirodiclofen. CYP392E10 also metabolizes spiromesifen, but not spirotetramat. Surprisingly, no metabolism of the hydrolyzed spirodiclofen-enol metabolite could be detected. These findings are discussed in the light of a likely resistance mechanism.
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Affiliation(s)
- Peter Demaeght
- Department of Crop Protection, Faculty of Bioscience Engineering, Coupure Links 653, Ghent University, B-9000 Ghent, Belgium
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26
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Karatolos N, Williamson MS, Denholm I, Gorman K, ffrench-Constant R, Nauen R. Resistance to spiromesifen in Trialeurodes vaporariorum is associated with a single amino acid replacement in its target enzyme acetyl-coenzyme A carboxylase. INSECT MOLECULAR BIOLOGY 2012; 21:327-334. [PMID: 22458881 DOI: 10.1111/j.1365-2583.2012.01136.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Spiromesifen is a novel insecticide and is classed as a tetronic acid derivative. It targets the insects' acetyl-coenzyme A carboxylase (ACCase) enzyme, causing a reduction in lipid biosynthesis. At the time of this publication, there are no reports of resistance to this class of insecticides in insects although resistance has been observed in several mite species. The greenhouse whitefly Trialeurodes vaporariorum (Westwood) is a serious pest of protected vegetable and ornamental crops in temperate regions of the world and spiromesifen is widely used in its control. Mortality rates of UK and European populations of T. vaporariorum to spiromesifen were calculated and up to 26-fold resistance was found. We therefore sought to examine the molecular mechanism underlying spiromesifen resistance in this important pest. Pre-treatment with piperonyl butoxide did not synergize spiromesifen, suggesting a target-site resistance mechanism. The full length ACCase gene was sequenced for a range of T. vaporariorum strains and a strong association was found between spiromesifen resistance and a glutamic acid substitution with lysine in position 645 (E645K) of this gene. A TaqMan allelic discrimination assay confirmed these findings. Although this resistance is not considered sufficient to compromise the field performance of spiromesifen, this association of E645K with resistance is the first report of a potential target site mechanism affecting an ACCase inhibitor in an arthropod species.
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Affiliation(s)
- N Karatolos
- Rothamsted Research, West Common, Harpenden, UK.
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27
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Marcic D, Petronijevic S, Drobnjakovic T, Prijovic M, Peric P, Milenkovic S. The effects of spirotetramat on life history traits and population growth of Tetranychus urticae (Acari: Tetranychidae). EXPERIMENTAL & APPLIED ACAROLOGY 2012; 56:113-122. [PMID: 22042022 DOI: 10.1007/s10493-011-9500-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Accepted: 10/22/2011] [Indexed: 05/31/2023]
Abstract
The effects of spirotetramat, a tetramic acid derivative, on gross fertility, net fertility, female longevity and the instantaneous rate of increase of two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae) were investigated after treatment of female teleiochrysalises (the first assay) and pre-ovipositional females (the second assay). Spirotetramat was applied to the leaf discs by Potter spray tower and the following series of concentrations was applied: 200, 60, 18, 5.4 and 1.62 mg/l. In both assays after 24 h of exposure, surviving females without symptoms of poisoning were used for further procedure. In the first assay, gross fertility of treated females was reduced by 2.4-64.7% and net fertility by 12.4-88.8%, compared to the control. Gross fertility of the females treated with 1.62 and 5.4 mg/l did not significantly differ from the control, whereas all concentrations, except the lowest, significantly reduced net fertility and female longevity. Treatments with 200, 60, and 18 mg/l significantly reduced the instantaneous rate of increase. In the second assay, gross fertility and net fertility were reduced by 43.7-93.3% and 73.8-98.5%, respectively. All concentrations, except the lowest, significantly reduced gross fertility, whereas net fertility and longevity in all treated females were significantly lower compared to the control. All concentrations, except the lowest, significantly reduced the instantaneous rate of increase, provided that concentrations of 200, 60 and 18 mg/l caused population decline. The effects of spirotetramat and its impact on T. urticae management are discussed.
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Affiliation(s)
- Dejan Marcic
- Laboratory of Applied Entomology, Institute of Pesticides and Environmental Protection, Banatska 31B, Belgrade-Zemun, Serbia.
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