University of Hertfordshire

  • Qiong Rao
  • Yong-hua Xu
  • Chen Luo
  • Hong-yu Zhang
  • Christopher M. Jones
  • Greg J. Devine
  • Kevin Gorman
  • Ian Denholm
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Original languageEnglish
Pages (from-to)321-326
Number of pages6
JournalJournal of Integrative Agriculture
Volume11
Issue2
DOIs
Publication statusPublished - Feb 2012

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.

ID: 1935379