Effect of Temperature on Toxicity and Knockdown Activity of cis-Permethrin˜ Esfenvalerate˜and A-Cyhalothrin in the Cabbage Looper (Lepidoptera: Noctuidae)

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The time required for two symptoms of poisoning, ataxia and prostration (Le., knockdown), to occur in third-instar cabbage loopers, Trichoplusia ni (Hiibner), treated topically with ci8-permethrin, esfenvalerate, and X-cyhalothrin was determined at 15.6, 26.7, and 37.8ºC. The toxicity of the pyrethroids also was examined at the three temperatures. ci8-Permethrin and X-cyhalothrin had negative temperature coefficients of toxicity between 15.6 and 37.8ºC, whereas esfenvalerate was equally toxic at both temperatures. The onset of ataxia and prostration in larvae treated with these pyrethroids occurred more rapidly as the temperature increased, thus was positively correlated with temperature. X-Cyhalothrin was the most toxic pyrethroid; however, ci8-permethrin was generally the most effective in producing ataxia and prostration in treated larvae.

Document Type: Research Article

Publication date: April 1, 1990

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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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