Eur. J. Entomol. 91 (3): 285-295, 1994
Pyrethroid resistance and esterase activity in selected laboratory populations of sweetpotato whiteflies Bemisia tabaci (Homoptera: Aleyrodidae)
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Selection for resistance to fenpropathrin (a pyrethroid insecticide) was performed by exposing adults of two field-collected populations of the whitefly, Bemisia tabaci, to increasing doses of fenpropathrin for four generations. Concurrently, samples of adults were used for colorimetric measurements of esterase (EST) activity.
The two populations differed in their response to selection. EST activity increased as a correlated response to pyrethroid selection in one population but not in the. other. No changes in either resistance or esterase activity were detected in the unselected control lines. The data suggest that both resistance and EST activity have a genetic basis, and that the frequency of high EST-activity alleles may have been different in the two populations.
Keywords: Toxicology, Bemisia tabaci, whiteflies, insecticide resistance, esterase activity
Accepted: December 20, 1993; Published: August 5, 1994 Show citation
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