Characterisation of Neonicotinoid and Pymetrozine Resistance in Strains of Bemisia tabaci (Hemiptera: Aleyrodidae) from China |
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| Institution: | 1. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China;2. Institute of Plant and Environmental Protection, Beijing Academy of Agriculture & Forestry Sciences, Beijing 100097, P.R. China;3. Plant and Invertebrate Ecology Department, Rothamsted Research, Harpenden, Herts AL5 2JQ, United Kingdom;4. Zhejiang Chemical Industry Research Institute, Zhejiang Branch of National Pesticide R&D South Center, Hangzhou 310023, P.R. China |
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| Abstract: | Four strains of the Q biotype and one of the B biotype of the whitefly Bemisia tabaci collected from China were characterised for resistance to four neonicotinoid insecticides and pymetrozine. Q biotype strains showed moderate to strong resistance to imidacloprid, thiamethoxam and acetamiprid, but little or no cross-resistance to dinotefuron. Resistance to neonicotinoids was consistently associated with resistance to pymetrozine, despite the latter having a distinct (though unresolved) mode of action. The single B biotype strain proved largely susceptible to all the insecticides investigated. Resistance in the Q biotype strains was associated with over-expression of a cytochrome P450 monooxygenase gene, CYP6CM1, whose substrate specificity presumably accounts for the observed cross-resistance profiles. |
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