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Pharmacokinetics of Fenvalerate in Laboratory and Field Strains of Helicoverpa zea (Lepidoptera: Noctuidae)

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Pharmacokinetics of fenvalerate-l4C were examined in the bollworm, Helicoverpa zea (Boddie), 3rd instars from a pyrethroid-susceptible strain (BCIRL-S), a field strain (ARK) that possessed a low level of resistance to this pyrethroid (resistance ratio 2.7-fold at LD90), and a composite strain (HZC) that was reared under pyrethroid selection but did not significantly differ from ARK larvae in its suceptibility to fenvalerate. We observed differences in rates of fenvalerate penetration and degradation among larvae from the 3 strains. Based on actual disappearance of total radiocarbon from the insect rinses, half-times for fenvaleratc penetration were ≍7, 16, and 18 h in BCIRL-S, ARK, and HZC 3rd instars, respectively. Fenvalerate was degraded fastest by HZC larvae followed by BCIRL-C and ARK larvae. The only difference in fenvalerate pharmacokinetics likely related to toxicity was slower pyrethroid penetration in the ARK and HZC strains as compared with the BCIRL-S strain.

Document Type: Research Article

Publication date: June 1, 1996

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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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