Monday, December 10, 2007
D0161
Selection for imidacloprid resistance in the whitefly Bemisia tabaci B-biotype
Mamy L. Rakotondravelo, rakotond@msu.edu, David Mota-Sanchez, motasanc@msu.edu, Terry Davis, tdavis@msu.edu, and David Smitley, smitley@msu.edu. Michigan State University, Department of Entomology, Natural Science Building, East Lansing, MI
A silverleaf whitefly, Bemisia tabaci B-biotype, population was collected from a commercial greenhouse in Michigan, reared in greenhouses at Michigan State University and selected with imidacloprid by using systemic uptake of imidacloprid through stems of cotton seedlings at the second true-leaf stage of growth. The parental generation showed about 10-fold resistance compared with a susceptible strain. The level of resistance increased to 30-fold in the second generation and to 195-fold in the fifth generation. This rapid increase of resistance levels suggests a potential problem with the repeated use of imidacloprid in commercial greenhouses. Cross-resistances to other neonicotinoid compounds registered for use in the greenhouses are being tested.
Species 1: Hemiptera Aleyrodidae Bemisia tabaci (silverleaf whitefly, sweetpotato whitefly)
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