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Lou Y, Wu R. Modeling insect growth regulators for pest management. J Math Biol 2024; 88:73. [PMID: 38679652 DOI: 10.1007/s00285-024-02091-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 03/30/2024] [Accepted: 04/02/2024] [Indexed: 05/01/2024]
Abstract
Insect growth regulators (IGRs) have been developed as effective control measures against harmful insect pests to disrupt their normal development. This study is to propose a mathematical model to evaluate the cost-effectiveness of IGRs for pest management. The key features of the model include the temperature-dependent growth of insects and realistic impulsive IGRs releasing strategies. The impulsive releases are carefully modeled by counting the number of implements during an insect's temperature-dependent development duration, which introduces a surviving probability determined by a product of terms corresponding to each release. Dynamical behavior of the model is illustrated through dynamical system analysis and a threshold-type result is established in terms of the net reproduction number. Further numerical simulations are performed to quantitatively evaluate the effectiveness of IGRs to control populations of harmful insect pests. It is interesting to observe that the time-changing environment plays an important role in determining an optimal pest control scheme with appropriate release frequencies and time instants.
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Affiliation(s)
- Yijun Lou
- Department of Applied Mathematics, Hong Kong Polytechnic University, Hong Kong SAR, China
| | - Ruiwen Wu
- Department of Mathematics, Jinan University, Guangzhou, 510632, China.
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2
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Ilyaskina D, Fernandes S, Berg MP, Lamoree MH, van Gestel CAM, Leonards PEG. Exploring the Relationship Among Lipid Profile Changes, Growth, and Reproduction in Folsomia candida Exposed to Teflubenzuron Over Time. Environ Toxicol Chem 2024. [PMID: 38517147 DOI: 10.1002/etc.5851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/15/2023] [Accepted: 02/14/2024] [Indexed: 03/23/2024]
Abstract
The integration of untargeted lipidomics approaches in ecotoxicology has emerged as a strategy to enhance the comprehensiveness of environmental risk assessment. Although current toxicity tests with soil microarthropods focus on species performance, that is, growth, reproduction, and survival, understanding the mechanisms of toxicity across all levels of biological organization, from molecule to community is essential for informed decision-making. Our study focused on the impacts of sublethal concentrations of the insecticide teflubenzuron on the springtail Folsomia candida. Untargeted lipidomics was applied to link changes in growth, reproduction, and the overall stress response with lipid profile changes over various exposure durations. The accumulation of teflubenzuron in organisms exposed to the highest test concentration (0.035 mg a.s. kg-1 soil dry wt) significantly impacted reproductive output without compromising growth. The results suggested a resource allocation shift from reproduction to size maintenance. This hypothesis was supported by lipid shifts on day 7, at which point reductions in triacylglycerol and diacylglycerol content corresponded with decreased offspring production on day 21. The hypermetabolism of fatty acids and N-acylethanolamines on days 2 and 7 of exposure indicated oxidative stress and inflammation in the animals in response to teflubenzuron bioaccumulation, as measured using high-performance liquid chromatography-tandem mass spectrometry. Overall, the changes in lipid profiles in comparison with phenotypic adverse outcomes highlight the potential of lipid analysis as an early-warning tool for reproductive disturbances caused by pesticides in F. candida. Environ Toxicol Chem 2024;00:1-12. © 2024 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Affiliation(s)
- Diana Ilyaskina
- Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Saúl Fernandes
- Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Matty P Berg
- Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Marja H Lamoree
- Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Cornelis A M van Gestel
- Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Pim E G Leonards
- Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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Moura L, Corbi JJ. Regionality in vector control: effect of fluctuating temperature in the susceptibility of Aedes aegypti (Diptera: Culicidae) larvae to Pyriproxyfen. Parasitol Res 2023; 123:23. [PMID: 38072863 DOI: 10.1007/s00436-023-08065-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 10/24/2023] [Indexed: 12/18/2023]
Abstract
Using Pyriproxyfen in controlling Aedes aegypti shows great potential considering its high competence in low dosages. As an endocrine disruptor, temperature can interfere with its efficiency, related to a decrease in larval emergence inhibition in hotter environments. However, previous studies have been performed at constant temperatures in the laboratory, which may not precisely reflect the environmental conditions in the field. The aim of this study was to assess the effect of the fluctuating temperatures in Pyriproxyfen efficiency on controlling Aedes aegypti larvae. We selected maximum and minimum temperatures from the Brazilian Meteorological Institute database from September to April for cities grouped by five regions. Five fluctuating temperatures (17-26; 20-28.5; 23-32.5; 23-30.5; 19.5-31 °C) were applied to bioassays assessing Pyriproxyfen efficiency in preventing adult emergence in Aedes aegypti larvae in five concentrations. In the lowest temperatures, the most diluted Pyriproxyfen treatment (0.0025 mg/L) was efficient in preventing the emergence of almost thrice the larvae than in the hottest temperatures (61% and 21%, respectively, p value = 0.00015). The concentration that inhibits the emergence of 50% of the population was lower than that preconized by the World Health Organization (0.01 mg/L) in all treatments, except for the hottest temperatures, for which we estimated 0.010 mg/L. We concluded that fluctuating temperatures in laboratory bioassays can provide a more realistic result to integrate the strategies in vector surveillance. For a country with continental proportions such as Brazil, considering regionalities is crucial to the rational use of insecticides.
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Affiliation(s)
- Lidia Moura
- Aquatic Ecology Laboratory, Department of Hydraulic and Sanitation, São Carlos School of Engineering, University of São Paulo, São Carlos, São Paulo, Brazil.
| | - Juliano José Corbi
- Aquatic Ecology Laboratory, Department of Hydraulic and Sanitation, São Carlos School of Engineering, University of São Paulo, São Carlos, São Paulo, Brazil
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Saleem M, Hussain D, Hasan MU, Sagheer M, Ghouse G, Zubair M, Brown J, Cheema SA. Differential insecticide resistance in Bemisia tabaci (Hemiptera: Aleyrodidae) field populations in the Punjab Province of Pakistan. Heliyon 2022; 8:e12010. [PMID: 36544822 PMCID: PMC9761603 DOI: 10.1016/j.heliyon.2022.e12010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 08/10/2022] [Accepted: 11/23/2022] [Indexed: 12/14/2022] Open
Abstract
The cotton whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) has a propensity for developing high-level resistance to insecticides. Management of B. tabaci in cotton grown in Pakistan depends on insecticide use, resistance monitoring has become essential to minimize the development of resistance. In this study, resistance was monitored in adult whiteflies collected from cotton fields in the Bahawalpur, Faisalabad, Lodhran, Multan, and Vehari districts of the Punjab Province, Pakistan during 2017, 2018, and 2019. Resistance monitoring was carried out for two insect growth regulators (pyriproxyfen and buprofezin) four neonicotinoids acetamiprid, imidacloprid, thiamethoxam, thiacloprid, and the historically used pyrethroid, bifenthrin and organophosphate, chlorpyrifos. Results based on resistance ratio (RR) showed that moderate to high level of resistance against noenicitinoids insecticides have been observed in all four districts while whiteflies exhibited very low to low resistance to pyriproxyfen and buprofezin. The RRs for acetamiprid, imidacloprid, thiamethoxam, thiacloprid varied from 7.60 to 50.99, 19.32 to 65.72, 17.18 to 54.65 and 6.49-47.49-fold, respectively. Bifenthrin and chlorpyrifos showed very low toxicity against whiteflies in all districts except Faisalabad, with RRs of 12.28-50.56-fold and 7.94-26.24-fold, respectively. The results will facilitate 'smart' selection and guide rates of insecticide applications for whitefly management in cotton for effective whitefly management while also delaying the development of resistance.
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Affiliation(s)
- Muhammad Saleem
- Entomological Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan
- Corresponding author.
| | - Dilbar Hussain
- Entomological Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan
| | - Mansoor ul Hasan
- Department of Entomology, University of Agriculture, Faisalabad, Pakistan
| | - Muhammad Sagheer
- Department of Entomology, University of Agriculture, Faisalabad, Pakistan
| | - Ghulam Ghouse
- Pest Warning & Quality Control of Pesticide, Punjab, Pakistan
| | - Muhammad Zubair
- Oil Seed Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan
| | - J.K. Brown
- School of Plant Sciences, The University of Arizona, Tucson, Arizona, 85721 USA
| | - Sikander Ali Cheema
- Oil Seed Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan
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Borges DA, Cid YP, Magalhães VDS, Alves MCC, Ferreira TP, Bonfim IV, Lima EAS, de Freitas JP, Scott FB. Fluazuron orally administered to guinea pigs: pharmacokinetic and efficacy against Amblyomma sculptum. Parasit Vectors 2022; 15:198. [PMID: 35689268 PMCID: PMC9188223 DOI: 10.1186/s13071-022-05325-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 05/13/2022] [Indexed: 11/21/2022] Open
Abstract
Background Brazilian spotted fever (BSF), the most lethal tick-borne disease in the Western Hemisphere, is caused by the bacterium Rickettsia rickettsii and transmitted by the bite of Amblyomma sculptum. Capybaras are considered primary hosts of this tick and amplifier hosts of R. rickettsii, generating new infected lineages of A. sculptum in BSF-endemic areas. To define a possible treatment regimen for controlling the tick A. sculptum in capybaras, the aim of this study was to establish an effective fluazuron (FLU) dose to control A. sculptum larvae in artificially infested guinea pigs. Methods In Study I (pharmacokinetic and pharmacodynamic analysis), 24 guinea pigs were divided into four equal groups: control group (CG; untreated) and treated groups receiving FLU administered by gavage in three doses: G1—1 mg/kg, G2—5 mg/kg and G3—10 mg/kg, once a day for 15 days (d0 to d + 14). Blood samples were collected from the animals of the treated groups before and at d + 1, + 2, + 4, + 7, + 15 and + 21. The guinea pigs were artificially infested at d + 7 with A. sculptum larvae, and specimens were recovered at d + 11 to d + 14 and kept in a climatized chamber for 14 days. In Study II (evaluation of pharmacokinetic parameters), one group of eight animals received FLU administered by gavage in a single dose of 10 mg/kg, and blood samples were collected before and on day 0 (8 h after treatment), + 1, + 4, + 7, + 15, + 21 and + 28 after single FLU administration. FLU was analyzed in plasma samples by high-performance liquid chromatography with ultraviolet detection. Results FLU plasma concentrations increased quickly, indicating rapid absorption, and decreased slowly. Some larvae from all treated groups exhibited morphological and behavioral changes. FLU interfered in molting, and the efficacy obtained was 100% for all treated groups. Conclusions The results offer promising perspectives for the development of a palatable feed cube containing FLU for free-living capybaras to control A. sculptum and also to prevent BSF in areas where capybaras have been shown to play a primary role.
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Affiliation(s)
- Debora Azevedo Borges
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil.
| | - Yara Peluso Cid
- Pharmaceutical Science Department, Health and Biological Science Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
| | - Viviane de Sousa Magalhães
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
| | - Melina Cardilo Campos Alves
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
| | - Thais Paes Ferreira
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
| | - Isabelle Vilela Bonfim
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
| | - Emily Andressa Santos Lima
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
| | - Juliana Pereira de Freitas
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
| | - Fabio Barbour Scott
- Animal Parasitology Department, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
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Mansoor MM, Shad SA. Risk assessment of cyromazine and methoxyfenozide resistance suggests higher additive genetic but lower environmental variation supporting quick resistance development in non-target Chrysoperla carnea (Stephens). Environ Monit Assess 2022; 194:66. [PMID: 34993647 DOI: 10.1007/s10661-021-09735-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
Insecticides are effective against economic pests, but these pose serious threats to the environment and ecosystem components such as natural enemies. Resistance risk assessment forecasts insecticide resistance development in target pests and non-target biological control agents under special conditions. Field-collected Chrysoperla carnea was selected with two Insect Growth Regulators (IGRs) viz. cyromazine and methoxyfenozide for 15 generations to determine the resistance development potential of this natural enemy. Selection to cyromazine and methoxyfenozide induced 759.08-fold and 3531.67-fold resistance with realized heritability of 0.37 and 0.62 in C. carnea, respectively, suggesting higher additive genetic variations in first half of selection (h2 = 0.46 for cyromazine and h2 = 0.75 for methoxyfenozide) than in second half (h2 = 0.18 and 0.25, respectively). Estimates of projected rate of resistance development indicate C. carnea will take only 6 to 2 generations at h2 = 0.37, 8 to 2 at h2 = 0.27, and 5 to 2 at h2 = 0.27, at constant slope = 1.81 for a tenfold increase in cyromazine resistance. At h2 = 0.37, 3-1, and 10-8 generations would be needed for this increase in LC50 if slope = 0.82 and 2.82, respectively. Similarly, it may take 3 to 1 generations at h2 = 0.62 and 0.72, but 4 to 1 at h2 = 0.52, at constant slope = 1.62, for a tenfold increase in methoxyfenozide resistance. On the same h2 = 0.62, 1-0, and 5-1 generations would be required for increase if slope = 0.62 and 2.62, respectively. Selection and resistance to both insecticides induced an insignificant difference in the sex ratio of C. carnea. These results confirm that this natural enemy has tremendous potential for resistance development under selection pressure.
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Affiliation(s)
- Muhammad Mudassir Mansoor
- Department of Entomology, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Punjab, Pakistan.
| | - Sarfraz Ali Shad
- Department of Entomology, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Punjab, Pakistan.
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Valbon WR, Hatano E, Oliveira NRX, Ataíde ÁD, Corrêa MJM, Gomes SF, Martins GF, Haddi K, Alvarenga ES, Oliveira EE. Detrimental effects of pyriproxyfen on the detoxification and abilities of Belostoma anurum to prey upon Aedes aegypti larvae. Environ Pollut 2021; 284:117130. [PMID: 33910136 DOI: 10.1016/j.envpol.2021.117130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 03/18/2021] [Accepted: 04/09/2021] [Indexed: 06/12/2023]
Abstract
Despite being effective in controlling mosquito larvae and a few other target organisms, the application of insecticides into aquatic systems may cause unintended alterations to the physiology or behavioral responses of several aquatic non-target organisms, which can ultimately lead to their death. Here, we firstly evaluated whether the susceptibility of the giant water bug, Belostoma anurum (Hemiptera: Belostomatidae), a predator of mosquito larvae, to pyriproxyfen would be similar to that of its potential prey, larvae of Aedes aegypti (Diptera: Culicidae). Secondly, we recorded the nominal concentrations of pyriproxyfen in water and evaluated whether sublethal exposures would lead to physiological or behavioral alterations on the B. anurum nymphs. We characterized the activities of three major families of detoxification enzymes (i.e., cytochrome P450 monooxygenases, glutathione-S-transferase, and general esterases) and further evaluated the abilities of pyriproxyfen sublethally-exposed B. anurum to prey upon A. aegypti larvae at different prey densities. Our findings revealed that nominal pyriproxyfen concentration significantly decreased (approximately 50%) over the first 24 h. Furthermore, when applied at the concentration of 10 μg a.i./L, pyriproxyfen was approximately four times more toxic to A. aegypti larvae (LT50 = 48 h) than to B. anurum nymphs (LT50 = 192 h). Interestingly, the pyriproxyfen sublethally-exposed (2.5 μg a.i./L) B. anurum nymphs exhibited reduced enzyme activities (cytochrome P450 monooxygenases) involved in detoxication processes and preyed significantly less on A. aegypti larvae when compared to unexposed predators. Collectively, our findings demonstrate that mortality-based pyriproxyfen risk assessments are not always protective of aquatic non-target organisms.
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Affiliation(s)
- Wilson R Valbon
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Eduardo Hatano
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, United States
| | | | - Álvaro D Ataíde
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | | | - Sabriny F Gomes
- Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Gustavo F Martins
- Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Khalid Haddi
- Departamento de Entomologia, Universidade Federal de Lavras, Lavras, MG, Brazil
| | - Elson S Alvarenga
- Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Eugênio E Oliveira
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
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Mohd Ngesom AM, Ahmad Razi A, Azizan NS, Wasi Ahmad N, Md Lasim A, Liang Y, Greenhalgh D, Min JCS, Sahani M, Hod R, Othman H. Evaluation of a mosquito home system for controlling Aedes aegypti. Parasit Vectors 2021; 14:413. [PMID: 34407881 PMCID: PMC8375193 DOI: 10.1186/s13071-021-04918-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 08/02/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Dengue is a significant public health issue that is caused by Aedes spp. mosquitoes. The current vector control methods are unable to effectively reduce Aedes populations and thus fail to decrease dengue transmission. Hence, there is an urgent need for new tools and strategies to reduce dengue transmission in a wide range of settings. In this study, the Mosquito Home System (MHS) and Mosquito Home Aqua (MHAQ) formulations were assessed as commercial autodissemination traps in laboratory and small-scale field trials. METHOD Multiple series of laboratory and small-scale field trials were performed to assess the efficacy of MHS and MHAQ exposed to Ae. aegypti. In the laboratory trials, various parameters such as fecundity, fertility, wing size, oviposition preferences, residual effects, and MHAQ transference to other containers through controlled experiments were tested. For small-scale field trials, the efficacy of the MHS and MHAQ approaches was determined to ascertain whether wild mosquitoes could transfer the MHAQ formulation from MHS stations to ovitraps. RESULTS The data revealed that Ae. aegypti was highly susceptible to low concentrations of MHAQ formulations and had a residual effect of up to 3 months, with MHAQ exposure affecting fecundity, fertility, and mosquito wing size. In the oviposition studies, gravid females strongly preferred the hay infusion compared to tap water and MHAQ during egg-laying in the laboratory. Nevertheless, the use of commercial MHAQ by MHS was highly attractive in field settings compared to conventional ovitraps among local Aedes spp. mosquitoes. In addition, MHAQ horizontal transfer activities in the laboratory and small-scale field trials were demonstrated through larval bioassays. These findings demonstrated the potential of MHAQ to be transferred to new containers in each study site. CONCLUSION This study provided proof of principle for the autodissemination of MHAQ. Through further refinement, this technique and device could become an effective oviposition trap and offer an alternative preventive tool for vector control management.
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Affiliation(s)
- Ahmad Mohiddin Mohd Ngesom
- Center for Toxicology and Health Risk, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 50300 Kuala Lumpur, Federal Territory of Kuala Lumpur, Malaysia
| | - Anis Ahmad Razi
- Center for Toxicology and Health Risk, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 50300 Kuala Lumpur, Federal Territory of Kuala Lumpur, Malaysia
| | - Nur Syahirah Azizan
- Center for Toxicology and Health Risk, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 50300 Kuala Lumpur, Federal Territory of Kuala Lumpur, Malaysia
| | - Nazni Wasi Ahmad
- Medical Entomology Unit, Infectious Disease Research Centre, Institute for Medical Research, National Institute of Health, Ministry of Health, 40170 Shah Alam, Selangor Malaysia
| | - Asmalia Md Lasim
- Phytochemistry Unit, Herbal Medicine Research Centre (HMRC), Institute for Medical Research, National Institute of Health, Ministry of Health, 40170 Shah Alam, Selangor Malaysia
| | - Yanfeng Liang
- Department of Mathematics and Statistics, University of Strathclyde, Glasgow, G1 1XH UK
| | - David Greenhalgh
- Department of Mathematics and Statistics, University of Strathclyde, Glasgow, G1 1XH UK
| | - Jasmine Chia Siew Min
- Department of Biomedical Science, Faculty of Medicine and Health Science, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
| | - Mazrura Sahani
- Center for Toxicology and Health Risk, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 50300 Kuala Lumpur, Federal Territory of Kuala Lumpur, Malaysia
| | - Rozita Hod
- Department of Community Health, Faculty of Medicine, Universiti Kebangsaan Malaysia, 50600 Cheras, Kuala Lumpur, Malaysia
| | - Hidayatulfathi Othman
- Center for Toxicology and Health Risk, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 50300 Kuala Lumpur, Federal Territory of Kuala Lumpur, Malaysia
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Hafeez M, Li X, Yousaf HK, Khan MM, Imran M, Zhang Z, Huang J, Zhang J, Shah S, Wang L, Fernández-Grandon GM, Ali S, Lu Y. Sublethal effects of bistrifluron on key biological traits, macronutrients contents and vitellogenin (SeVg) expression in Spodoptera exigua (Hübner). Pestic Biochem Physiol 2021; 174:104802. [PMID: 33838703 DOI: 10.1016/j.pestbp.2021.104802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 02/13/2021] [Accepted: 02/16/2021] [Indexed: 06/12/2023]
Abstract
The beet armyworm, Spodoptera exigua, is a highly polyphagous pest originated from Southeast Asia but has spread globally, attacking economically important crops and fruits. Bistrifluron insecticide is one of the highly active insect growth regulators that has been reported to inhibit development and longevity in other lepidopteran species and could be used in the control of S. exigua. In the present study, the age-stage, two-sex life table technique was applied to assess the sublethal effects of bistrifluron on biological traits and vitellogenin gene (SeVg) expression when 2nd instar larvae fed to sublethal concentrations (LC10, LC20 and LC40) of bistrifluron. Mean generation time from eggs to adults was longer at LC40 (37.79 ± 0.81 d) and LC20 (37.04 ± 0.72) compared to the LC10 (36.89 ± 0.63 d) and control groups (36.07 ± 0.38 d). Fecundity of female at LC40 (279.17 ± 42.8 eggs), LC20 (347 ± 35.4 eggs) and LC10 (411.58 ± 42.38 eggs) were significantly lower than the control treatment (532.47 ± 7.13). Furthermore, the lower intrinsic rates of increase (LC40; r = 0.1207 ± 0.009, LC20; r = 0.1329 ± 0.009 and LC10; r = 0.14398 ± 0.009 compared to the control r = 0.164 ± 0.0076), was observed along with significantly extended mean generation times (LC40; T = 34.825 ± 0.317 days, LC20; T = 33.27 ± 0.368 days and LC10; T = 31.899 ± 0.398 days compared to the control 30.927 ± 0.255 days). Furthermore, the contents of energy reserve macronutrients (carbohydrate, lipid and protein) significantly reduced in dose and time dependent manner in treated insects as compared to control. Furthermore, the expression level of SeVg mRNA significantly decreased by 43.8% in the female adults when one-day-old second instar larvae were treated with sublethal concentrations of bistrifluron in comparison with the control. Documenting these sublethal effects is a vital, and often overlooked factor, in assessing the overall efficacy of insecticides in the management of pest populations.
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Affiliation(s)
- Muhammad Hafeez
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Zhejiang Academy of Agricultural Sciences, Institute of Plant Protection and Microbiology, Hangzhou 310021, PR China
| | - Xiaowei Li
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Zhejiang Academy of Agricultural Sciences, Institute of Plant Protection and Microbiology, Hangzhou 310021, PR China
| | | | - Muhammad Musa Khan
- Key Laboratory of Bio-Pesticide Innovation and Application, Guangdong Province, South China Agricultural University, Guangzhou 510642, China
| | - Muhammad Imran
- Department of Chemistry, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
| | - Zhijun Zhang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Zhejiang Academy of Agricultural Sciences, Institute of Plant Protection and Microbiology, Hangzhou 310021, PR China
| | - Jun Huang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Zhejiang Academy of Agricultural Sciences, Institute of Plant Protection and Microbiology, Hangzhou 310021, PR China
| | - Jinming Zhang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Zhejiang Academy of Agricultural Sciences, Institute of Plant Protection and Microbiology, Hangzhou 310021, PR China
| | - Sakhawat Shah
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University Wuhan, Hubei 430070, PR China
| | - Likun Wang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Zhejiang Academy of Agricultural Sciences, Institute of Plant Protection and Microbiology, Hangzhou 310021, PR China
| | | | - Sajjad Ali
- Department of Botany, Bacha Khan University Charsadda, KPK, Pakistan
| | - Yaobin Lu
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Zhejiang Academy of Agricultural Sciences, Institute of Plant Protection and Microbiology, Hangzhou 310021, PR China.
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10
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Zhou Y, Qin DQ, Zhang PW, Liu BJ, Chen XT, Zhang ZX. The comparative metabolic response of Bactrocera dorsalis larvae to azadirachtin, pyriproxyfen and tebufenozide. Ecotoxicol Environ Saf 2020; 189:110020. [PMID: 31809954 DOI: 10.1016/j.ecoenv.2019.110020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 11/11/2019] [Accepted: 11/27/2019] [Indexed: 06/10/2023]
Abstract
Azadirachtin, as the most promising and effective botanical insecticide, exhibits significant growth inhibition activity against agricultural and forestry pests. However, its biochemical effects at the metabolic level compared with those of other insect growth regulators have not been studied. Therefore, in this study, a GC-MS based untargeted metabolomics approach was applied to compare azadirachtin with pyriproxyfen (a juvenile hormone analog) and tebufenozide (a molting hormone analog) in terms of their metabolic effects on Bactrocera dorsalis larvae. The bioactivity of azadirachtin against B. dorsalis larvae was significantly different than those of pyriproxyfen and tebufenozide. A total of 693 mass features were recognized, and 112 metabolites were identified in this study. The results showed that a total of 16, 13 and 10 differentially regulated metabolites corresponding to 12, 5 and 8 pathways occur in Aza versus CK, Pyr versus CK and Teb versus CK group, respectively. Further analysis showed that 6 differentially regulated metabolites corresponding to 5 key pathways could be the primary differential metabolic response of B. dorsalis larvae to the three insect growth regulators. The pathways were myo-inositol corresponding to ascorbate and aldarate metabolism as the specific response of B. dorsalis larvae to azadirachtin; xylitol, xylulose and 3-aminopropionitrile corresponding to pentose and glucuronate interconversions, and cyanoamino acid metabolism as the common responses to azadirachtin and pyriproxyfen; and 3-hydroxypropionic acid and beta-alanine corresponding to propanoate metabolism and beta-alanine metabolism as the specific responses to tebufenozide. The results showed that the metabolic response of B. dorsalis larvae to azadirachitin is closer to that of pyriproxyfen than tebufenozide. The differentially regulated metabolites and pathways responsible for this difference are discussed.
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Affiliation(s)
- You Zhou
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - De-Qiang Qin
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Pei-Wen Zhang
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Ben-Ju Liu
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Xiao-Tian Chen
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Zhi-Xiang Zhang
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China.
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11
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Abdelhamid AA, Elwassimy MM, Aref SA, Gad MA. Chemical design and bioefficacy screening of new insect growth regulators as potential insecticidal agents against Spodoptera littoralis (Boisd.). ACTA ACUST UNITED AC 2019; 24:e00394. [PMID: 31799143 PMCID: PMC6881669 DOI: 10.1016/j.btre.2019.e00394] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 11/03/2019] [Accepted: 11/06/2019] [Indexed: 11/23/2022]
Abstract
The 13 new compounds were chemically synthesized and their spectroscopic analysis was done to determine their chemical structure. All the compounds were screened for their insecticidal potential against Spodoptera littoralis (Boisd.). Among the tested compounds, the compound 13 was found to be the most potent. It displayed one fold more activity than a reported insect growth regulator, fenoxycarb. The other target compounds demonstrated weak to strong toxicological activities against Spodoptera littoralis (Boisd.).
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Affiliation(s)
- Antar A Abdelhamid
- Department of Chemistry, Faculty of Science, Sohag University, 82524 Sohag, Egypt
| | - M M Elwassimy
- Department of Chemistry, Faculty of Science, Sohag University, 82524 Sohag, Egypt
| | - Safwat A Aref
- Research Institute of Plant Protection, Agriculture Research Center, 12112 Giza, Egypt
| | - Mohamed A Gad
- Research Institute of Plant Protection, Agriculture Research Center, 12112 Giza, Egypt
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12
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Porretta D, Fotakis EA, Mastrantonio V, Chaskopoulou A, Michaelakis A, Kioulos I, Weill M, Urbanelli S, Vontas J, Bellini R. Focal distribution of diflubenzuron resistance mutations in Culex pipiens mosquitoes from Northern Italy. Acta Trop 2019; 193:106-12. [PMID: 30825446 DOI: 10.1016/j.actatropica.2019.02.024] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 02/19/2019] [Accepted: 02/22/2019] [Indexed: 11/20/2022]
Abstract
Insecticide resistance is a major threat for vector control and prevention of mosquito borne diseases. In the Culex pipiens mosquitoes, resistance against diflubenzuron (DFB) was firstly detected in Ravenna (Emilia-Romagna region, Northern Italy), in 2015. The resistant phenotypes were associated with two mutations, I1043 M and I1043 L, at the amino acid 1043 of the chitin synthase gene. In this study, we monitored the presence, frequency and geographical distribution of the DFB resistant mutations in Cx. pipiens populations from Northern Italy, and in populations from Greece and France. In the Emilia-Romagna region, the resistant mutations were detected in 20 out of the 30 populations analysed, reaching allelic frequencies over 70%. The presence and distribution of the resistance mutations was highly focal, with a clear pattern of increasing resistant allelic frequencies moving from the Western towards the Eastern provinces of Emilia-Romagna. Contrary to Italy, DFB resistant alleles were not detected in the Cx. pipiens mosquitoes sampled from Greece and France. Following statistical, literature and bibliographical database analyses on the history of DFB insecticide use in the study areas, we suggest that the selection pressures from the intense agricultural DFB applications occurring throughout the' 80-'90 s against orchard pests, followed, from 2000s onwards by mosquito control DFB applications, may account for the high mutation frequencies observed in the Cx. pipiens populations of the Eastern provinces of Emilia-Romagna. The findings are of major concern for public health in Italy and Europe, as DFB remains a very important insecticide used for controlling arbovirus mosquito vectors, where alternative larvicides are extremely limited.
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13
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He F, Sun S, Sun X, Ji S, Li X, Zhang J, Jiang X. Effects of insect growth-regulator insecticides on the immature stages of Harmonia axyridis (Coleoptera: Coccinellidae). Ecotoxicol Environ Saf 2018; 164:665-674. [PMID: 30170315 DOI: 10.1016/j.ecoenv.2018.08.076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 08/18/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
Harmonia axyridis is an important biological control predator in greenhouses and agricultural fields, and it plays a significant role in the integrated pest management (IPM) of several arthropod pests. We studied the effects of eight insect growth-regulator insecticides (IGRs) on immature stages of H. axyridis by residual toxicity (eggs and pupae) and contact toxicity (larvae) to evaluate the risk of using these IGRs in IPM systems. Diflubenzuron, hexaflumuron and lufenuron caused more than 80% mortality to H. axyridis eggs, larvae and pupae, respectively. Pyriproxyfen was also highly harmful to larvae and pupae of H. axyridis. In contrast, methoxyfenozide and buprofezin caused little mortality and were classified as slightly harmful to immature stages based on a reduction coefficient. In addition to mortality and developmental time, the fecundity, fertility and deformed eggs of offspring were affected, when the predators were exposed to IGRs. Benzoylphenylurea insecticides significantly reduced H. axyridis female fecundity and fertility and increased the number of deformed eggs. The adverse effects are closely connected with the developmental stages of the predators and types and methods of insecticides exposed. All IGRs affected, to some extent, the life-table parameters of H. axyridis when the insecticides applied on immature stages at the highest field rates. Tebufenozide, diflubenzuron, hexaflumuron and lufenuron significantly reduced the Ro, T, r and λ of beetles exposed to the insecticides. The results indicate that IGRs could disturb the population growth and biocontrol activities of H. axyridis when applied at the highest field label rates. Additional studies should be conducted to assess the effects of IGRs on H. axyridis under field conditions before incorporating them in IPM strategies.
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Affiliation(s)
- Falin He
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Shiang Sun
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Xiao Sun
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Shoumin Ji
- Research Center of Pesticide Environmental Toxicology, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Xiangdong Li
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Jiwang Zhang
- College of Agronomy, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Xingyin Jiang
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, China; Research Center of Pesticide Environmental Toxicology, Shandong Agricultural University, Tai'an, Shandong 271018, China.
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14
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Abstract
In the broadest definition, a pesticide (from fly swatters to chemicals) is a substance used to eliminate a pest. Newer insecticides are much safer to the environment, humans, and nontarget species. These insecticides are able to target physiologic differences between insects and mammals, resulting in greater mammalian safety. This article briefly reviews toxicity information of both older insecticides such as organophosphates, carbamates, permethrins, and pyrethroids, as well as some newer insecticides.
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Affiliation(s)
- Tina Wismer
- ASPCA Animal Poison Control Center, 1717 South Philo Road, Suite 36, Urbana, IL 61802, USA.
| | - Charlotte Means
- ASPCA Animal Poison Control Center, 1717 South Philo Road, Suite 36, Urbana, IL 61802, USA
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15
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Song S, Zhang C, Chen Z, He F, Wei J, Tan H, Li X. Simultaneous determination of neonicotinoid insecticides and insect growth regulators residues in honey using LC-MS/MS with anion exchanger-disposable pipette extraction. J Chromatogr A 2018; 1557:51-61. [PMID: 29735281 DOI: 10.1016/j.chroma.2018.05.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 05/02/2018] [Accepted: 05/02/2018] [Indexed: 11/17/2022]
Abstract
In this study, we developed an anion exchanger-disposable pipette extraction (DPX) method to detect the residual concentrations of eight neonicotinoid insecticides (dinotefuran, acetamiprid, clothianidin, thiacloprid, imidachloprid, imidaclothiz, nitenpyram, and thiamethoxam) and eight insect growth regulators (IGRs; triflumuron, cyromazine, buprofezin, methoxyfenozide, tebufenozide, chromafenozide, fenoxycarb, and RH 5849) in Chinese honey samples collected from different floral sources and different geographical regions using liquid chromatography tandem mass spectrometry (LC-MS/MS). QAE Sephadex A-25 was used as the anion exchanger in the DPX column for the purification and cleanup of honey samples. Analytes were eluted with a mixture of acetonitrile and 0.1 M HCl, and the elution was subjected to LC analysis. This method was thoroughly validated for its reproducibility, linearity, trueness, and recovery. Satisfactory recovery of pesticides was obtained ranging from 72% to 111% with intraday RSDs (n = 5) of 1%-10%. High linearity (R2 ≥ 0.9987) was observed for all 16 pesticides. Limits of detection and quantification for all 16 compounds ranged from 0.3 to 3 μg/kg and from 1 to 10 μg/kg, respectively. Pesticide residues (9-113 μg/kg) were found in Chinese honey samples. The anion exchanger-DPX method was effective for removing sugars and retaining target analytes. Moreover, this method was highly reliable and sensitive for detecting neonicotinoids and IGRs in different floral sources of honey and will be applicable to matrixes with high sugar content.
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Affiliation(s)
- Shiming Song
- Institute of Pesticide & Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product Safety, Guangxi University, Nanning 530005, China
| | - Cuifang Zhang
- Institute of Pesticide & Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product Safety, Guangxi University, Nanning 530005, China
| | - Zhaojie Chen
- Institute of Pesticide & Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product Safety, Guangxi University, Nanning 530005, China
| | - Fengmei He
- Institute of Pesticide & Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product Safety, Guangxi University, Nanning 530005, China
| | - Jie Wei
- Institute of Pesticide & Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product Safety, Guangxi University, Nanning 530005, China
| | - Huihua Tan
- Institute of Pesticide & Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product Safety, Guangxi University, Nanning 530005, China
| | - Xuesheng Li
- Institute of Pesticide & Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product Safety, Guangxi University, Nanning 530005, China.
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16
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Diédhiou SM, Konaté L, Doucouré S, Samb B, Niang EA, Sy O, Thiaw O, Konaté A, Wotodjo AN, Diallo M, Gadiaga L, Sokhna C, Faye O. [Effectiveness of three biological larvicides and of an insect growth regulator against Anopheles arabiensis in Senegal]. ACTA ACUST UNITED AC 2016; 110:102-115. [PMID: 27942991 DOI: 10.1007/s13149-016-0531-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 07/07/2016] [Indexed: 11/30/2022]
Abstract
Urban malaria is a major public health problem in Africa. In Senegal, the environmental changes seem to favor the persistence of malaria transmission in Dakar suburbs by creating, throughout the year, potential breeding sites of malaria vectors. In such a situation and in a context of a growing threat of insecticide resistance in anopheline vectors, the larval control making use of products from biological origin or growth regulators could represent an additional tool to the current strategies developed against anophelines. In this study conducted in 2012, the efficiency and residual effect of three biological larvicides (VectoBac® WG, Vecto-Max® CG, and VectoBac® GR) and an insect growth regulator (MetaLarv™) were evaluated on Anopheles gambiae s.l. larvae in seminatural conditions (experimental station) and natural breeding sites in the suburbs of Dakar. The formulations were tested according to the manufacturer recommendations, namely 0.03 g/m2 for VectoBac® WG, 0.5 g/m2 for VectoBac® GR, 0.75 g/m2 for VectoMax® CG, and 0.5 g/m2 for MetaLarv™. In experimental station, the treatment with larvicides was effective over a period of 14 days with a mortality ranging between 92% and 100%. The insect growth regulator remained effective up to 55 days with a single emergence recorded in the 27th day after treatment. In natural conditions, a total effectiveness (100% mortality) of larvicides was obtained 48 hours after treatment, then a gradual recolonization of breeding sites was noted. However, the insect growth regulator has reduced adult emergence higher than 80% until the end of follow-up (J28). This study showed a good efficiency of the larvicides and of the growth regulator tested. These works provide current data on potential candidates for the implementation of larval control interventions in addition to that of chemical adulticide for control of urban malaria.
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Affiliation(s)
- S M Diédhiou
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal. .,Unité de recherche sur les maladies infectieuses et tropicales émergentes (Urmite), IRD, UMR 198, CNRS 6236, Inserm 1095, Aix-Marseille-Université Campus UCAD-IRD, BP 1386, CP 18524, Dakar, Sénégal.
| | - L Konaté
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal
| | - S Doucouré
- Unité de recherche sur les maladies infectieuses et tropicales émergentes (Urmite), IRD, UMR 198, CNRS 6236, Inserm 1095, Aix-Marseille-Université Campus UCAD-IRD, BP 1386, CP 18524, Dakar, Sénégal
| | - B Samb
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal
| | - E A Niang
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal
| | - O Sy
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal
| | - O Thiaw
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal.,Unité de recherche sur les maladies infectieuses et tropicales émergentes (Urmite), IRD, UMR 198, CNRS 6236, Inserm 1095, Aix-Marseille-Université Campus UCAD-IRD, BP 1386, CP 18524, Dakar, Sénégal
| | - A Konaté
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal
| | - A N Wotodjo
- Unité de recherche sur les maladies infectieuses et tropicales émergentes (Urmite), IRD, UMR 198, CNRS 6236, Inserm 1095, Aix-Marseille-Université Campus UCAD-IRD, BP 1386, CP 18524, Dakar, Sénégal
| | - M Diallo
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal
| | - L Gadiaga
- Programme national de lutte contre le paludisme, Dakar, Sénégal
| | - C Sokhna
- Unité de recherche sur les maladies infectieuses et tropicales émergentes (Urmite), IRD, UMR 198, CNRS 6236, Inserm 1095, Aix-Marseille-Université Campus UCAD-IRD, BP 1386, CP 18524, Dakar, Sénégal
| | - O Faye
- Laboratoire d'écologie vectorielle et parasitaire, faculté des sciences et techniques, université Cheikh-Anta-Diop de Dakar, Dakar, Sénégal
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17
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Abass KM. An investigation into the formation of tebufenozide's toxic aromatic amine metabolites in human in vitro hepatic microsomes. Pestic Biochem Physiol 2016; 133:73-78. [PMID: 27742364 DOI: 10.1016/j.pestbp.2016.03.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 03/01/2016] [Accepted: 03/02/2016] [Indexed: 06/06/2023]
Abstract
Tebufenozide is a nonsteroid ecdysone agonist that causes premature and incomplete molting in Lepidoptera. Studies conducted so far have shown the low toxicity of tebufenozide in mammals, birds and invertebrates. Tebufenozide potential metabolites such as aromatic amines are known to induce methemoglobinemia disorder in humans, most likely by the formation of N-hydroxy metabolites; therefore, the aim of this research is to investigate the formation of the potential toxic N-hydroxy derivatives in pooled human hepatic microsomal fractions. Analyses of metabolites by high performance liquid chromatography equipped by a time-of-flight detector (HPLC/TOF) indicated the formation of a hydroxylated metabolite (exact mass=369; retention time: 6.65min) and two de-dimethylethyl metabolites (exact masses=313; retention times: 5.76 and 6.22min). Hydroxylated tebufenozide metabolite resulted from hydroxylation at either the 3 or 5 position of the dimethylbenzoic acid moiety to form either 3-hydroxymethyl-5-methylbenzoic acid 1-(1,1-dimethylethyl)-2-(4-ethylbenzoyl) or 3-methyl-5-hydroxymethylbenzoic acid 1-(1,1-dimethylethyl)-2-(4-ethylbenzoyl), respectively. The two de-dimethylethyl-tebufenozide derivatives were 3,5-dimethylbenzoic acid-2-(4-hydroxyethylbenzoyl) and 3-hydroxymethyl-5-methylbenzoic acid-2-(4-ethylbenzoyl) or 3-methyl-5-hydroxymethylbenzoic acid-2-(4-ethylbenzoyl). Generally the metabolite formation rates increased with incubation time. The rate of hydroxylation of the dimethylbenzoic acid moiety was approximately 12 times higher than the hydroxylation of the ethylbenzoyl moiety. Tebufenozide does not appear to produce the toxic aromatic amine metabolites in human in vitro hepatic microsomes. This suggests that the fate of tebufenozide in humans is a process of detoxification rather than activation.
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Affiliation(s)
- Khaled M Abass
- Research Unit of Biomedicine, P.O. Box 5000, FI-90014, University of Oulu, Oulu, Finland.
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18
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Saha I, Joy VC. Short-term biochemical ill effects of insect growth regulator (IGR) pesticides in Cyphoderus javanus Borner (Collembola: Insecta) as potential biomarkers of soil pollution. Environ Monit Assess 2016; 188:98. [PMID: 26780417 DOI: 10.1007/s10661-015-5083-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 12/22/2015] [Indexed: 06/05/2023]
Abstract
The insect growth regulator (IGR) chemicals are considered as safe alternatives to synthetic organic pesticides, but only scant information are available on their possible impact on non-target and ecologically important soil insect fauna of croplands. Previous studies by the authors showed that recommended agricultural doses of IGRs buprofezin (Applaud 25SC at 250 g a.i. ha(-1)), flubendiamide (Takumi 20WG at 50 g a.i. ha(-1)) and novaluron (Rimon 10EC at 100 g a.i. ha(-1)) produced less mortality of adults of a non-target soil insect Cyphoderus javanus Borner (Collembola) but decreased major life history parameters namely moulting, fecundity and egg hatching success. This detritivorous microarthropod is very sensitive to soil characteristics and is ecologically relevant to the tropical soils. Present microcosm study showed strong biochemical impact of the above doses of IGRs on tissue nutrient levels and digestive enzyme activities in C. javanus within 7 days of exposure to treated sandy loam soil. The levels of tissue proteins, carbohydrates, lipids and free amino acids declined significantly and persistently in the specimens reared in IGR-treated soils than in the specimens of untreated soil. Similarly, α-amylase, cellulase and protease activities declined significantly in the specimens of IGR-treated soil. These nutritional scarcities would reduce metabolism, growth and reproduction in the affected insects. Therefore, the observed biochemical responses, especially the levels of tissue proteins, carbohydrates and α-amylase activity in C. javanus are early warning indices and potential biomarkers of soil pollution in croplands.
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Affiliation(s)
- Ipsita Saha
- Soil Ecology Laboratory, Department of Zoology (CAS), Visva-Bharati University, Santiniketan, 731235, West Bengal, India.
| | - V C Joy
- Soil Ecology Laboratory, Department of Zoology (CAS), Visva-Bharati University, Santiniketan, 731235, West Bengal, India.
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19
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Cespedes CL, Alarcon J, Aqueveque PM, Lobo T, Becerra J, Balbontin C, Avila JG, Kubo I, Seigler DS. New environmentally-friendly antimicrobials and biocides from Andean and Mexican biodiversity. Environ Res 2015; 142:549-562. [PMID: 26298556 DOI: 10.1016/j.envres.2015.08.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 08/06/2015] [Accepted: 08/06/2015] [Indexed: 06/04/2023]
Abstract
Persistent application of pesticides often leads to accumulation in the environment and to the development of resistance in various organisms. These chemicals frequently degrade slowly and have the potential to bio-accumulate across the food chain and in top predators. Cancer and neuronal damage at genomic and proteomic levels have been linked to exposure to pesticides in humans. These negative effects encourage search for new sources of biopesticides that are more "environmentally-friendly" to the environment and human health. Many plant or fungal compounds have significant biological activity associated with the presence of secondary metabolites. Plant biotechnology and new molecular methods offer ways to understand regulation and to improve production of secondary metabolites of interest. Naturally occurring crop protection chemicals offer new approaches for pest management by providing new sources of biologically active natural products with biodegradability, low mammalian toxicity and environmentally-friendly qualities. Latin America is one of the world's most biodiverse regions and provide a previously unsuspected reservoir of new and potentially useful molecules. Phytochemicals from a number of families of plants and fungi from the southern Andes and from Mexico have now been evaluated. Andean basidiomycetes are also a great source of scientifically new compounds that are interesting and potentially useful. Use of biopesticides is an important component of integrated pest management (IPM) and can improve the risks and benefits of production of many crops all over the world.
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Affiliation(s)
- Carlos L Cespedes
- Phytochemical-Ecology, Grupo de Investigación Quimica y Biotecnología de Productos Naturales Bioactivos, Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad del Bio Bio, Chillan, Chile.
| | - Julio Alarcon
- Synthesis/Biotransformation of Natural Products Labs, Grupo de Investigación Quimica y Biotecnología de Productos Naturales Bioactivos, Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad del Bio Bio, Chillan, Chile
| | - Pedro M Aqueveque
- Laboratorio de Microbiología y Micología Aplicada, Departamento de Agroindustrias, Facultad de Ingeniería Agrícola, Universidad de Concepción, Chillan, Chile
| | - Tatiana Lobo
- Escuela de Quimica, Facultad de Ciencias, Universidad Nacional de Colombia sede Medellin, Colombia
| | - Julio Becerra
- Synthesis/Biotransformation of Natural Products Labs, Grupo de Investigación Quimica y Biotecnología de Productos Naturales Bioactivos, Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad del Bio Bio, Chillan, Chile
| | - Cristian Balbontin
- Phytochemical-Ecology, Grupo de Investigación Quimica y Biotecnología de Productos Naturales Bioactivos, Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad del Bio Bio, Chillan, Chile
| | - Jose G Avila
- Laboratorio de Fitoquimica, Unidad UBIPRO, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autonoma de Mexico, Tlalnepantla, Mexico DF, Mexico
| | - Isao Kubo
- ESPM Departmenty, University of California at Berkeley, CA, USA
| | - David S Seigler
- Department of Plant Biology, Herbarium, University of Illinois at Urbana-Champaign, IL, USA
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Suman DS, Wang Y, Bilgrami AL, Gaugler R. Ovicidal activity of three insect growth regulators against Aedes and Culex mosquitoes. Acta Trop 2013; 128:103-9. [PMID: 23860181 DOI: 10.1016/j.actatropica.2013.06.025] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Revised: 06/21/2013] [Accepted: 06/30/2013] [Indexed: 10/26/2022]
Abstract
Interspecific variations in the susceptibility of freshly and embryonated eggs of Aedes albopictus, Ae. aegypti, Ae. atropalpus and Culex pipiens were tested against three classes of insect growth regulators (IGRs) including ecdysone agonist (azadirachtin), chitin synthesis inhibitor (diflubenzuron) and juvenile hormone analog (pyriproxyfen) at 0.001, 0.01, 0.1 and 1.0ppm concentrations. Egg hatching inhibition was dose dependent, the highest being at 1.0ppm concentration for freshly laid eggs of Ae. albopictus (pyriproxyfen: 80.6%, azadirachtin: 42.9% and diflubenzuron: 35.8%). Aedes aegypti showed lower egg hatching inhibition when exposed to pyriproxyfen (47.3%), azadirachtin (15.7%) and diflubenzuron (25.5%). Freshly laid eggs of Cx. pipiens were most susceptible to diflubenzuron. Aedes atropalpus eggs were tolerant to all three classes of IGRs. Embryonated eggs of Ae. albopictus, Ae. aegypti, Ae. atropalpus and Cx. pipiens were resistant to pyriproxyfen, azadirachtin and diflubenzuron than freshly laid eggs. The median desiccation time (DT50) of Ae. atropalpus eggs was maximum (5.1h) as compared to Ae. aegypti (4.9h), Ae. albopictus (3.9h) or Cx. pipiens (1.7h) eggs. Insignificant relationship between the rates of desiccation and egg hatching inhibition suggests other factors than physical providing eggs the ability to tolerate exposures to various IGRs. Egg hatching inhibition was due to the alteration in embryonic development caused by IGRs. Changes in the egg shell morphology and abnormal egg hatching from the side of the egg wall instead of operculum, was observed at higher concentrations of diflubenzuron. Morphological and physiological variations in eggs may be the key factor to influence the ovicidal efficacy of IGRs. The present data provide a base line for the improvement of the ovicidal efficacy of the insecticide and its formulation.
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