Toxicity of Synthetic Pyrethroids to Laboratory and Field Populations of the Tobacco Budworm in Central Texas

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Populations of Heliothis virescens (F.) collected in cotton fields in Central Texas in 1978 and 1979 showed ca. 6-fold tolerance to permethrin and 2-fold tolerance to fenvalerate in comparison with a previously tested laboratory strain of this species. Similar levels of tolerance occurred to pyrethroid:chlordimeform combinations. The tolerance present in the 1978 field-collected insects disappeared within 10 generations in the laboratory. Thus, the apparent "tolerance" of the field collected insects to pyrethroids may only reflect differences associated with laboratory rearing of the budworm and not acquired resistance.

Document Type: Research Article

Publication date: April 1, 1981

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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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