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Liu J, Wu J, Jin P, Hu J, Lamour K, Yang Z. Activity of the Succinate Dehydrogenase Inhibitor Fungicide Benzovindiflupyr Against Clarireedia spp. PLANT DISEASE 2023; 107:3924-3932. [PMID: 37340553 DOI: 10.1094/pdis-02-23-0201-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/22/2023]
Abstract
Dollar spot (DS), caused by Clarireedia spp. (formerly Sclerotinia homoeocarpa), is one of the most important diseases of turfgrasses worldwide. Benzovindiflupyr, a pyrazole carboxamide fungicide belonging to succinate dehydrogenase inhibitors, was recently registered for DS control. In this study, baseline sensitivity, toxicity, and control efficacy of benzovindiflupyr against Clarireedia spp. were evaluated. The frequency of sensitivities had a unimodal distribution (Kolmogorov-Smirnov, P > 0.10). The mean EC50 value was 1.109 ± 0.555 μg/ml, with individual values ranging from 0.160 to 2.548 μg/ml. Benzovindiflupyr increased the number of hyphal offshoots and cell membrane permeability and inhibited oxalic acid production. Positive cross-resistance was observed between benzovindiflupyr and boscalid, but not between benzovindiflupyr and thiophanate-methyl, propiconazole, or iprodione. Benzovindiflupyr showed high protective and curative control efficacies in vivo and in field applications. Both protective and curative control efficacies of benzovindiflupyr were significantly better than propiconazole, and equivalent to boscalid, over 2 years of field research. The results have important implications for managing DS and fungicide resistance problems in Clarireedia spp.
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Affiliation(s)
- Jun Liu
- College of Agro-Grassland Science, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Jiaxuan Wu
- College of Agro-Grassland Science, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Peiyuan Jin
- College of Agro-Grassland Science, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Jian Hu
- College of Agro-Grassland Science, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Kurt Lamour
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, U.S.A
| | - Zhimin Yang
- College of Agro-Grassland Science, Nanjing Agricultural University, Nanjing 210095, P.R. China
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2
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Wang X, Aboughanem-Sabanadzovic N, Sabanadzovic S, Tomaso-Peterson M, Wilkerson TH, Allen TW. Defining Fungicide Resistance Mechanisms in the Corynespora cassiicola Population from Mississippi Soybean. PLANT DISEASE 2023; 107:2365-2374. [PMID: 36774572 DOI: 10.1094/pdis-06-22-1297-re] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Target spot, caused by Corynespora cassiicola, is a common lower canopy soybean disease in the southern United States. Recently, target spot has resurged in importance especially following the identification of resistance to the quinone outside inhibitor (QoI) fungicides. As a result, a survey of C. cassiicola from soybean throughout Mississippi began in 2018. A total of 819 C. cassiicola monoconidial isolates were obtained from 228 fields in 75 counties. The molecular mechanism of QoI resistance was determined, which resulted from an amino acid substitution from glycine (G) to alanine (A) at position 143 using a PCR-RFLP method and comparing nucleotide sequences of the cytochrome b gene. Five previously defined geographic regions were used to present the distribution of the G143A substitution and included the Capital, Coast, Delta, Hills, and Pines. The Capital had the greatest proportion of G143A-containing isolates (95.0%), followed by the Coast (92.9%), Delta (89.8%), Pines (78.8%), and Hills (69.4%). In all, 85.8% of the C. cassiicola isolates carried the G143A substitution. In addition, the effective fungicide concentration (EC50) of randomly selected C. cassiicola isolates to azoxystrobin was used to characterize isolates as resistant (n = 14) (based on the presence of the G143A substitution and EC50 values >52 μg/ml) or sensitive (n = 11) (based on the absence of the G143A substitution and EC50 values <46 μg/ml). The EC50 values varied among isolates (P < 0.0001), with QoI-sensitive isolates exhibiting lower EC50 values than QoI-resistant isolates. The current study revealed that a reduction in sensitivity to QoI fungicides has likely resulted based on the percentage of C. cassiicola isolates containing the G143A substitution identified in Mississippi.
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Affiliation(s)
- Xiaopeng Wang
- Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
- Valent U.S.A. LLC, Leland, MS 38756
| | - Nina Aboughanem-Sabanadzovic
- Institute for Genomics, Biocomputing, and Biotechnology, Mississippi State University, Mississippi State, MS 39762
| | - Sead Sabanadzovic
- Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State, MS 39762
| | - Maria Tomaso-Peterson
- Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State, MS 39762
| | - Tessie H Wilkerson
- Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
| | - Tom W Allen
- Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
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Usman HM, Tan Q, Karim MM, Adnan M, Yin WX, Zhu FX, Luo CX. Sensitivity of Colletotrichum fructicola and Colletotrichum siamense of Peach in China to Multiple Classes of Fungicides and Characterization of Pyraclostrobin-Resistant Isolates. PLANT DISEASE 2021; 105:3459-3465. [PMID: 34132595 DOI: 10.1094/pdis-04-21-0693-re] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Anthracnose, mainly caused by Colletotrichum gloeosporioides species complex including Colletotrichum fructicola and Colletotrichum siamense, is a devastating disease of peach. Chemical control has been widely used for years, but management failures have increased with the commonly used fungicides. Therefore, screening of sensitivity of Colletotrichum spp. to fungicides with different modes of action is needed to make proper management strategies for peach anthracnose. In this study, the sensitivity of 80 isolates of C. fructicola and C. siamense was screened for pyraclostrobin, procymidone, prochloraz, and fludioxonil based on mycelial growth inhibition at discriminatory doses. Results showed that C. fructicola and C. siamense isolates were highly resistant to procymidone and fludioxonil with 100% resistance frequencies to both fungicides, but sensitive to prochloraz, i.e., no resistant isolates were found. For pyraclostrobin, 74% of C. fructicola isolates showed high resistance, 26% showed low resistance, and all of the C. siamense isolates showed low resistance. No positive cross-resistance was observed between pyraclostrobin and azoxystrobin even when they are members of the same quinone outside inhibitor (QoI) fungicide group or between pyraclostrobin and non-QoIs. Resistant isolates to QoI fungicides were evaluated for the fitness penalty. Results showed that no significant differences except for the mycelial growth rates that were detected between high- and low-resistance isolates of C. fructicola. Molecular characterization of the Cyt b gene revealed that the G143A point mutation was the determinant of the high resistance in C. fructicola. This study demonstrated the resistance status of C. fructicola and C. siamense to different fungicides and briefly discussed implications of that resistance. Demethylation inhibitor fungicides were found to be the best option among the different chemicals studied here, to control peach anthracnose in China.
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Affiliation(s)
- Hafiz Muhammad Usman
- Key Laboratory of Horticultural Plant Biology, Ministry of Education and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Qin Tan
- Key Laboratory of Horticultural Plant Biology, Ministry of Education and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Mohammad Mazharul Karim
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Plant Pathology Division, Bangladesh Agricultural Research Institute, Gazipur 1701, Bangladesh
| | - Muhammad Adnan
- Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou 510642, China
| | - Wei-Xiao Yin
- Hubei Key Laboratory of Plant Pathology and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Fu-Xing Zhu
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Chao-Xi Luo
- Key Laboratory of Horticultural Plant Biology, Ministry of Education and College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
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Gao Y, Liu Y, He L, Zhu J, Wu B, Liu F, Mu W. Activity of the Novel Fungicide Mefentrifluconazole Against Colletotrichum scovillei. PLANT DISEASE 2021; 105:1522-1530. [PMID: 33237845 DOI: 10.1094/pdis-10-20-2157-re] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The prevalence and destructiveness of anthracnose, caused by Colletotrichum scovillei, in pepper production regions seriously affects pepper yield and quality. Mefentrifluconazole, the first of the isopropanol-azole subgroup of triazole fungicides, was introduced for the control of pepper anthracnose. However, the growth characteristics of pepper fruit and rapid spread of anthracnose suggest that the fungicide application method must be optimized to enhance fungicide efficacy. The sensitivity of C. scovillei to mefentrifluconazole was determined by mycelial growth and germ tube elongation assays using 157 single-spore isolates with mean 50% effective concentration values of 0.462 ± 0.138 and 0.359 ± 0.263 mg/liter, respectively. The in vivo data also showed that mefentrifluconazole had favorable protective and curative effects against pepper anthracnose. Mefentrifluconazole significantly affected C. scovillei infection on pepper by reducing appressorium formation and sporulation, shriveling spores and germ tubes, and causing the abnormal development of appressoria and conidiophores. Mefentrifluconazole could move acropetally, horizontally, and basipetally in pepper plants. Compared with a knapsack sprayer, mefentrifluconazole applied by mist sprayer exhibited significantly better activity against pepper anthracnose. Additionally, as the spray volume increased from 45 to 150 liters/ha, the control efficacy of mefentrifluconazole first increased and then tended to be steady, with an optimal spray volume of 90 liters/ha. The difference in disease control efficacy was related to the deposition and droplet distribution of mefentrifluconazole on the pepper fruit. These results provide scientific guidance for the application of mefentrifluconazole in pepper fields and improved fungicide utilization.
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Affiliation(s)
- Yangyang Gao
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
| | - Yang Liu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
| | - Lifei He
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
| | - Jiamei Zhu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
| | - Buhua Wu
- Jinan Tianbang Chemical Co. Ltd., Jinan, Shandong 251600, P.R. China
| | - Feng Liu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
| | - Wei Mu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, P.R. China
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5
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Colletotrichum eriobotryae sp. nov. and C. nymphaeae, the anthracnose pathogens of loquat fruit in central Taiwan, and their sensitivity to azoxystrobin. Mycol Prog 2020. [DOI: 10.1007/s11557-020-01565-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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6
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Gao YY, Li XX, He LF, Li BX, Mu W, Liu F. Effect of Application Rate and Timing on Residual Efficacy of Pyraclostrobin in the Control of Pepper Anthracnose. PLANT DISEASE 2020; 104:958-966. [PMID: 31944880 DOI: 10.1094/pdis-03-19-0435-re] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Anthracnose is a devastating disease that seriously affects pepper production worldwide. Anthracnose management is currently a major problem because of the widespread and long period of infection of this disease. Therefore, determination of the optimal fungicide application timing is important for controlling anthracnose in a timely manner . In vitro sensitivity tests showed no significant difference in the pyraclostrobin sensitivity of Colletotrichum scovillei collected from 2016 and 2017, with mean half maximal effective concentration values of 0.349 to 0.542 and 0.0475 to 0.0639 mg/liter for the inhibition of mycelial growth and spore germination, respectively. Fungicide application initiated at the full-bloom stage could significantly delay anthracnose disease onset, decrease anthracnose incidence and development (23.67 to 89.80%), and increase pepper yield by 10.7 to 29.2%. In addition, the application dosage was decreased by >50%. BF-500-3, the main metabolite of pyraclostrobin, was detected in pepper fruit and exhibited high inhibitory activity against C. scovillei. The final residues of all fungicides at different application timing were below maximum residue limits. Moreover, structural equation modeling indicated that application timing plays the most important role in anthracnose disease inhibition. The tank mixtures of pyraclostrobin with tebuconazole and fludioxonil showed more satisfactory efficacy (69.87 to 78.36%) against anthracnose than did pyraclostrobin alone under field conditions. This study is the first to determine the best fungicide application timing for anthracnose management. These results establish the basis for sustainable development of the pepper industry.
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Affiliation(s)
- Y Y Gao
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - X X Li
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - L F He
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - B X Li
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - W Mu
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - F Liu
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
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Materatski P, Varanda C, Carvalho T, Dias AB, Campos MD, Gomes L, Nobre T, Rei F, Félix MDR. Effect of Long-Term Fungicide Applications on Virulence and Diversity of Colletotrichum spp. Associated to Olive Anthracnose. PLANTS 2019; 8:plants8090311. [PMID: 31470646 PMCID: PMC6784085 DOI: 10.3390/plants8090311] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 08/11/2019] [Accepted: 08/28/2019] [Indexed: 11/16/2022]
Abstract
In this study, the presence and variability of Colletotrichum spp. was evaluated by comparing fungal isolates obtained from olive trees under long-time phytosanitary treatments with trees without any phytosanitary treatments (treated and untreated, respectively). Olive fruits of trees of the highly susceptible ‘Galega vulgar’ cultivar growing in the Alentejo region were used as samples. From the 210 olive trees sampled (half from treated and half from untreated orchards), 125 (59.5%) presented Colletotrichum spp., with a significant lower number of infected trees in treated (39) when compared to untreated orchards (86). The alignment and analysis of beta-tubulin (tub2), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), actin (ACT), chitin synthase (CHS-1) and histone H3 (HIS-3) gene sequences allowed the identification of all 125 isolates as belonging to the C. acutatum complex. The vast majority of the isolates (124) were identified as C. nymphaeae and one isolate, from an untreated tree, was identified as C. godetiae. Isolates were divided into five different groups: Group A: 39 isolates from treated trees matched in 100% with C. nymphaeae sequences from the database; Group B: 76 isolates from untreated trees matched in 100% with C. nymphaeae sequences from the database; Group C: one isolate from untreated trees presenting a single nucleotidic difference in the HIS-3 sequence; Group D: eight isolates from untreated trees presenting differences in two nucleotides in the tub2 sequences that changed the protein structure, together with differences in two specific nucleotides of the GAPDH sequences; Group E: one isolate, from untreated olive trees, matched 100% with C. godetiae sequences from the database in all genes. Considering the similarities of the sampled areas, our results show that the long-time application of fungicides may have caused a reduction in the number of olive trees infected with Colletotrichum spp. but an increase in the number of fruits positive to Colletotrichum spp. within each tree, which may suggest different degrees of virulence of Colletotrichum isolates from trees growing different management regimes. It is imperative that the fungicides described as causing resistance are applied at appropriate times and intervals, since their efficiency decreases when applied incorrectly and new and more virulent species may arise.
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Affiliation(s)
- Patrick Materatski
- ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Instituto de Investigação e Formação Avançada, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal.
| | - Carla Varanda
- ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Instituto de Investigação e Formação Avançada, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal
| | - Teresa Carvalho
- INIAV - Instituto Nacional de Investigação Agrária e Veterinária, I. P. Estrada de Gil Vaz, Apartado 6, 7351-901 Elvas, Portugal
| | - António Bento Dias
- Departamento de Engenharia Rural, ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Escola de Ciências e Tecnologia, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal
| | - Maria Doroteia Campos
- ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Instituto de Investigação e Formação Avançada, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal
| | - Luis Gomes
- ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Instituto de Investigação e Formação Avançada, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal
| | - Tânia Nobre
- ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Instituto de Investigação e Formação Avançada, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal
| | - Fernando Rei
- Departamento de Fitotecnia, ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Escola de Ciências e Tecnologia, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal
| | - Maria do Rosário Félix
- Departamento de Fitotecnia, ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Escola de Ciências e Tecnologia, Universidade de Évora, Polo da Mitra, Ap. 94, 7006-554 Évora, Portugal
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Vasić T, Vojinović U, Žujović S, Krnjaja V, Živković S, Marković J, Stević M. In vitro toxicity of fungicides with different modes of action to alfalfa anthracnose fungus, Colletotrichum destructivum. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2019; 54:964-971. [PMID: 31429367 DOI: 10.1080/03601234.2019.1653735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Sensitivity of 24 isolates of Colletotrichum destructivum O'Gara, collected from alfalfa plants in Serbia, to eight selected fungicides, was investigated in this study. Molecular identification and pathogenicity test of isolates tested were also performed. Fungicide sensitivity was evaluated in vitro, using mycelial growth assay method. All isolates exhibited significant pathogenicity, causing necrosis at the alfalfa seedling root tips two days after inoculation. Using the primer pair GSF1-SR1 and by comparing the amplified fragments of the tested isolates with the marker (M), the presence of the amplicon of the expected size of about 900 bp was determined for all isolates. The isolates tested in this study showed different sensitivity towards fungicides in vitro. Mycelial growth was highly inhibited by QoI (quinone outside inhibitors) fungicide pyraclostrobin (mean EC50=0.39 µg mL-1) and by DMI (demethylation-inhibiting) fungicide tebuconazole (mean EC50=0.61 µg mL-1), followed by azoxystrobin (mean EC50=2.83 µg mL-1) and flutriafol (mean EC50=2.11 µg mL-1). Multi-site fungicide chlorothalonil and MBC (methyl benzimidazole carbamate) fungicide thiophanate-methyl evinced moderate inhibition with mean EC50=35.31 and 62.83 µg mL-1, respectively. Thirteen isolates were sensitive to SDHI (succinate dehydrogenase inhibitors) fungicide boscalid and fluxapyroxad, (mean EC50=0.49 and 0.19 µg mL-1, respectively), while the rest of isolates were highly resistant.
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Affiliation(s)
- Tanja Vasić
- Institute for Forage Crops, Globoder, Kruševac, Serbia
| | - Uroš Vojinović
- Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
| | - Suzana Žujović
- Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
| | | | - Sanja Živković
- Faculty of Agriculture, University of Niš, Kruševac, Serbia
| | | | - Milan Stević
- Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
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9
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Wu JY, Hu XR, Zhang CQ. Molecular Detection of QoI Resistance in Colletotrichum gloeosporioides Causing Strawberry Anthracnose Based on Loop-Mediated Isothermal Amplification Assay. PLANT DISEASE 2019; 103:1319-1325. [PMID: 30998417 DOI: 10.1094/pdis-09-18-1593-re] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Anthracnose is one of the most common diseases in strawberry plants. Colletotrichum gloeosporioides is the major cause of anthracnose in China, including Zhejiang Province. Early, specific, reliable, and time-saving detection is urgently needed to prevent the further spread of C. gloeosporioides, guiding farmers to utilize chemicals to control anthracnose. In this study, we showed that the high resistance to pyraclostrobin, caused by a point mutation at codon 143 (GGT→GCT) in the cytochrome b gene of C. gloeosporioides was prevalent in the strawberry growing regions, and we developed a loop-mediated isothermal amplification (LAMP) assay as a detection method. Primer sets S0 and S4 could be used to specifically detect C. gloeosporioides isolates and the G143A mutations, respectively. A detection limit of 10-2 ng (10 pg), which is at least 10-fold more sensitive than conventional polymerase chain reaction, was achieved by the LAMP assay. Here, we utilized lateral-flow devices (LFDs), nitrocellulose membranes that can absorb nucleic acids, to acquire the total genomic DNA of strawberry plants within 2 min. The LFD membranes were used as DNA templates for the LAMP assays to accurately detect strawberry plants infected with C. gloeosporioides. This diagnostic method for strawberry anthracnose was accomplished within 1 h, including the sample preparation and LAMP assays. Collectively, we developed a sensitive and practical method for monitoring C. gloeosporioides and its quinone outside inhibitor-resistant mutants. The LAMP assay for detection of C. gloeosporioides in strawberry plants has great potential for rapid strawberry anthracnose surveillance and will provide farmers with advice on preventing C gloeosporioides at the early stages of strawberry development.
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Affiliation(s)
- J Y Wu
- College of Agriculture and Food Science, Zhejiang A&F University, Lin'an, Zhejiang, 311300, P.R. China
| | - X R Hu
- College of Agriculture and Food Science, Zhejiang A&F University, Lin'an, Zhejiang, 311300, P.R. China
| | - C Q Zhang
- College of Agriculture and Food Science, Zhejiang A&F University, Lin'an, Zhejiang, 311300, P.R. China
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10
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Ramdial H, De Abreu K, Rampersad SN. Fungicide Sensitivity among Isolates of Colletotrichum truncatum and Fusarium incarnatum-equiseti Species Complex Infecting Bell Pepper in Trinidad. THE PLANT PATHOLOGY JOURNAL 2017; 33:118-124. [PMID: 28381958 PMCID: PMC5378432 DOI: 10.5423/ppj.oa.06.2016.0138] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 11/01/2016] [Accepted: 11/06/2016] [Indexed: 06/07/2023]
Abstract
Bell pepper is an economically important crop worldwide; however, production is restricted by a number of fungal diseases that cause significant yield loss. Chemical control is the most common approach adopted by growers to manage a number of these diseases. Monitoring for the development to resistance to fungicides in pathogenic fungal populations is central to devising integrated pest management strategies. Two fungal species, Fusarium incarnatum-equiseti species complex (FIESC) and Colletotrichum truncatum are important pathogens of bell pepper in Trinidad. This study was carried out to determine the sensitivity of 71 isolates belonging to these two fungal species to fungicides with different modes of action based on in vitro bioassays. There was no significant difference in log effective concentration required to achieve 50% colony growth inhibition (LogEC50) values when field location and fungicide were considered for each species separately based on ANOVA analyses. However, the LogEC50 value for the Aranguez-Antracol location-fungicide combination was almost twice the value for the Maloney/Macoya-Antracol location-fungicide combination regardless of fungal species. LogEC50 values for Benomyl fungicide was also higher for C. truncatum isolates than for FIESC isolates and for any other fungicide. Cropping practices in these locations may explain the fungicide sensitivity data obtained.
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Affiliation(s)
- Hema Ramdial
- Department of Life Sciences, Faculty of Science and Technology, The University of the West Indies, St. Augustine,
Trinidad and Tobago
| | - Kathryn De Abreu
- Department of Life Sciences, Faculty of Science and Technology, The University of the West Indies, St. Augustine,
Trinidad and Tobago
| | - Sephra N. Rampersad
- Department of Life Sciences, Faculty of Science and Technology, The University of the West Indies, St. Augustine,
Trinidad and Tobago
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Ishii H, Zhen F, Hu M, Li X, Schnabel G. Efficacy of SDHI fungicides, including benzovindiflupyr, against Colletotrichum species. PEST MANAGEMENT SCIENCE 2016; 72:1844-1853. [PMID: 26732510 DOI: 10.1002/ps.4216] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 12/27/2015] [Accepted: 01/01/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND Colletotrichum species cause anthracnose diseases on many plants and crops. A new generation of succinate dehydrogenase inhibitors (SDHIs) was developed recently. The inhibitory activity of the five SDHI fungicides against Colletotrichum species was determined in this study. RESULTS Isolates of C. gloeosporioides, C. acutatum, C. cereale and C. orbiculare were insensitive (naturally resistant) to boscalid, fluxapyroxad and fluopyram on YBA agar medium. In contrast, these isolates were relatively sensitive to penthiopyrad, except for C. orbiculare. Most interestingly, benzovindiflupyr showed highest inhibitory activity against all of these four species. Benzovindiflupyr was effective against C. gloeosporioides and C. acutatum on apple and peach fruit, as well as on cucumber plants inoculated with C. orbiculare. The sdhB, sdhC and sdhD genes encoding the subunits of fungicide-targeted succinate dehydrogenase were sequenced, but, despite high polymorphisms, no apparent resistance mutations were found in Colletotrichum species. CONCLUSIONS This is the first report on the activity of benzovindiflupyr against Colletotrichum species. The broad-spectrum efficacy of benzovindiflupyr within the Colletotrichum genus might be exploited when designing disease management strategies against various pathogens on a wide range of crops. Other mechanism(s) than fungicide target-site modification may be responsible for differential sensitivity of Colletotrichum species to SDHI fungicides. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Hideo Ishii
- National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki, Japan
- Clemson University, Clemson, SC, USA
- Kibi International University, Minami-awaji, Hyogo, Japan
| | - Fan Zhen
- Clemson University, Clemson, SC, USA
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Vaghefi N, Hay FS, Kikkert JR, Pethybridge SJ. Genotypic Diversity and Resistance to Azoxystrobin of Cercospora beticola on Processing Table Beet in New York. PLANT DISEASE 2016; 100:1466-1473. [PMID: 30686198 DOI: 10.1094/pdis-09-15-1014-re] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Cercospora leaf spot (CLS), caused by Cercospora beticola, is one of the major diseases affecting productivity and profitability of beet production worldwide. Fungicides are critical for the control of this disease and one of the most commonly used products is the quinone outside inhibitor (QOI) azoxystrobin. In total, 150 C. beticola isolates were collected from two commercial processing table beet fields in Batavia, NY in 2014. The mating types of the entire population were determined, and genetic diversity of a subset of samples (n = 48) was assessed using five microsatellite loci. Sensitivity to azoxystrobin was tested using a spore germination assay. The cytochrome b gene was sequenced to check for the presence of point mutations known to confer QOI resistance in fungi. High allelic diversity (He = 0.50) and genotypic diversity (D* = 0.96), gametic equilibrium of the microsatellite loci, and equal ratios of mating types were suggestive of a mixed mode of reproduction for C. beticola. Resistance to azoxystrobin was prevalent because 41% of the isolates had values for effective concentrations reducing spore germination by 50% (EC50) > 0.2 μg/ml. The G143A mutation, known to cause QOI resistance in C. beticola, was found in isolates with EC50 values between 0.207 and 19.397 μg/ml. A single isolate with an EC50 of 0.272 μg/ml carried the F129L mutation, known to be associated with low levels of QOI resistance in fungi. This is the first report of the F129L mutation in C. beticola. The implications of these findings for the epidemiology and control of CLS in table beet fields in New York are discussed.
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Affiliation(s)
- Niloofar Vaghefi
- School of Integrative Plant Sciences, Plant Pathology & Plant-Microbe Biology Section, Cornell University, Geneva, NY 14456
| | - Frank S Hay
- School of Integrative Plant Sciences, Plant Pathology & Plant-Microbe Biology Section, Cornell University, Geneva, NY 14456
| | | | - Sarah J Pethybridge
- School of Integrative Plant Sciences, Plant Pathology & Plant-Microbe Biology Section, Cornell University, Geneva, NY 14456
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Lamichhane JR, Dachbrodt-Saaydeh S, Kudsk P, Messéan A. Toward a Reduced Reliance on Conventional Pesticides in European Agriculture. PLANT DISEASE 2016; 100:10-24. [PMID: 30688570 DOI: 10.1094/pdis-05-15-0574-fe] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Whether modern agriculture without conventional pesticides will be possible or not is a matter of debate. The debate is meaningful within the context of rising health and environmental awareness on one hand, and the global challenge of feeding a steadily growing human population on the other. Conventional pesticide use has come under pressure in many countries, and some European Union (EU) Member States have adopted policies for risk reduction following Directive 2009/128/EC, the sustainable use of pesticides. Highly diverse crop production systems across Europe, having varied geographic and climatic conditions, increase the complexity of European crop protection. The economic competitiveness of European agriculture is challenged by the current legislation, which banned the use of many previously authorized pesticides that are still available and applied in other parts of the world. This challenge could place EU agricultural production at a disadvantage, so EU farmers are seeking help from the research community to foster and support integrated pest management (IPM). Ensuring stable crop yields and quality while reducing the reliance on pesticides is a challenge facing the farming community is today. Considering this, we focus on several diverse situations in European agriculture in general and in European crop protection in particular. We emphasize that the marked biophysical and socio-economic differences across Europe have led to a situation where a meaningful reduction in pesticide use can hardly be achieved. Nevertheless, improvements and/or adoption of the knowledge and technologies of IPM can still achieve large gains in pesticide reduction. In this overview, the current pest problems and their integrated management are discussed in the context of specific geographic regions of Europe, with a particular emphasis on reduced pesticide use. We conclude that there are opportunities for reduction in many parts of Europe without significant losses in crop yields.
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Affiliation(s)
| | - Silke Dachbrodt-Saaydeh
- Julius Kühn-Institut, Federal Research Centre for Cultivated Plants, Stahnsdorfer Damm 81, 14532 Kleinmachnow, Germany
| | - Per Kudsk
- Aarhus University, Department of Agroecology, Forsoegsvej 1, 4200 Slagelse 14 Denmark
| | - Antoine Messéan
- INRA, UAR 1240 Eco-Innov, BP 01, 78850 Thiverval-Grignon, France
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Standish JR, Tomaso-Peterson M, Allen TW, Sabanadzovic S, Aboughanem-Sabanadzovic N. Occurrence of QoI Fungicide Resistance in Cercospora sojina from Mississippi Soybean. PLANT DISEASE 2015; 99:1347-1352. [PMID: 30690983 DOI: 10.1094/pdis-02-15-0157-re] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Frogeye leaf spot, caused by Cercospora sojina Hara, is a foliar disease affecting soybean (Glycine max (L.) Merr.), often managed by applications of quinone outside inhibitor (QoI) fungicides. In 2013 and 2014, 634 C. sojina monoconidial isolates were collected from soybean fields throughout Mississippi. Initially, in vitro bioassays were performed to evaluate the sensitivity of 14 of 634 isolates plus a baseline. Resistant and sensitive isolates were characterized by determining the effective fungicide concentrations at which 50% of conidial germination was inhibited (EC50). The molecular mechanism of resistance was determined for all 634 isolates, using a PCR-RFLP method and comparing nucleotide sequences of the cytochrome b gene. The state of Mississippi was divided into five distinct geographical regions (the Hills, Delta, Pines, Capital, and Coast) based on estimates of total soybean hectares. The greatest proportion (16.7%) of QoI-sensitive isolates was collected in the Hills while the Coast had no QoI-sensitive isolates. QoI-sensitive isolates from the Pines, Capital, and Delta ranged from 1.6 to 7.0%. Results of this study determined that more than 93% of C. sojina isolates collected in Mississippi carried the G143A amino acid substitution, indicating a shift to a QoI-resistant population throughout Mississippi soybean fields.
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Affiliation(s)
- J R Standish
- Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State 39762
| | - M Tomaso-Peterson
- Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State 39762
| | - T W Allen
- Delta Research and Extension Center, Mississippi State University, Stoneville 38776
| | - S Sabanadzovic
- Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State 39762
| | - N Aboughanem-Sabanadzovic
- Institute for Genomics, Biocomputing and Biotechnology, Mississippi State University, Mississippi State 39762
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A species-specific polymerase chain reaction assay for rapid and sensitive detection of Colletotrichum capsici. Mol Biotechnol 2011; 49:48-55. [PMID: 21253896 DOI: 10.1007/s12033-011-9377-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Colletotrichum capsici is an important fungal species that causes anthracnose in many genera of plants causing severe economic losses worldwide. A primer set was designed based on the sequences of the ribosomal internal transcribed spacer (ITS1 and ITS2) regions for use in a conventional PCR assay. The primer set (CcapF/CcapR) amplified a single product of 394 bp with DNA extracted from 20 Mexican isolates of C. capsici. The specificity of primers was confirmed by the absence of amplified product with DNA of four other Colletotrichum species and eleven different fungal genera. This primer set is capable of amplifying only C. capsici from different contaminated tissues or fungal structures, thereby facilitating rapid diagnoses as there is no need to isolate and cultivate the fungus in order to identify it. The sensitivity of detection with this PCR method was 10 pg of genomic DNA from the pathogen. This is the first report of a C. capsici-specific primer set. It allows rapid pathogen detection and provides growers with a powerful tool for a rational selection of fungicides to control anthracnose in different crops and in the post-harvest stage.
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