Fenvalerate Resistance Mechanisms in Western Flower Thrips (Thysanoptera: Thripidae)

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Pharmacokinetics were studied in two strains of wcstel1l Rower thrips, Frankliniella occidentalis (Pergande), that differed in their susceptibility to fenvalerate by 7-fold. Analyses at 1, 12, 24, and 48 h after continuous exposure revealed that fenvalerate-14C penetrated more slowly into thrips of the resistant KCM strain than into those of the more susceptible UMC strain. When expressed as percentage of total recovered radiocarbon, radioactivity in the internal extract of KCM thrips increased from 0.4% at 1 h to 2.5% at 48 h, whereas that in UMC thrips increased from 1.5 to 9.5% during the same time intelval. However, fenvalerate-14C metabolism was faster in KCM thrips than in UMC thrips. Of the total radiocarbon in the internal extracts at the four sampling times, fenvalerate composed 43 ± 2% in KCM thrips and 80 ± 2% in UMC thrips. Thus, decreased penetration and enhanced metabolism contributed to fenvalerate resistance in western flower thrips.

Document Type: Research Article

Publication date: June 1, 1995

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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