Characterisation of Neonicotinoid and Pymetrozine Resistance in Strains of Bemisia tabaci (Hemiptera: Aleyrodidae) from China

• Main Authors: Qiong RAO, Yong-hua XU, Chen LUO, Hong-yu ZHANG, Christopher M Jones, Greg J Devine, Kevin Gorman, Ian Denholm
• Format: Article
• Language: English
• Published: Elsevier 2012-02-01
• Series: Journal of Integrative Agriculture
• Subjects: P450; cross-resistance; pymetrozine; imidacloprid; thiamethoxam; acetamiprid
• Online Access: http://www.sciencedirect.com/science/article/pii/S2095311912600161

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.