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Baseline determination and detection of resistance to imidacloprid in Bemisia tabaci (Homoptera: Aleyrodidae)

  • Matthew Cahill (a1), Kevin Gorman (a1), Sara Day (a1), Ian Denholm (a1), Alfred Elbert (a2) and Ralf Nauen (a2)...

Adult Bemisia tabaci (Gennadius) were tested with imidacloprid in a bioassay method using systemically treated cotton leaves. The method was simple, robust and repeatable and provided baseline data for a laboratory and a number of recently collected field strains. The LC50 for imidacloprid susceptible strains was calculated to be 1.7 ppm and a concentration of 16 ppm determined as diagnostic for imidacloprid resistance. Ten strains of B. tabaci collected from the Almeria region of Spain showed significantly less mortality at the diagnostic dose than the susceptible strains. The intensive use of imidacloprid in the Almeria region is considered the reason for the occurrence of resistance in this locality. Resistance to organophosphates, pyrethroids and endosulfan in B-type and non-B type B. tabaci did not confer resistance to imidacloprid.

Corresponding author
Correspondence: Matthew Cahill, Department of Biological and Ecological Chemistry, IACR – Rothamsted, Harpenden, Herts, AL5 2JQ, UK.
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Bulletin of Entomological Research
  • ISSN: 0007-4853
  • EISSN: 1475-2670
  • URL: /core/journals/bulletin-of-entomological-research
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