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Laboratory and Field Studies on the Effectiveness and Persistence of Pyrethroid Insecticides used for Cabbage Looper Control

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In laboratory tests, permethrin (NRDC 143), Shell WL 41706 (alpha-cyano-3-phenoxybenzyl 2,2,3,3-tetramethylcyclopropanecarboxylate), Shell 43467 (alpha-cyano-3-phenoxybenzyl 2-(2,2- dichlorovinyl)-3,3-dimethylcyclopropanecarboxylate), and Shell WL 43775 (Pydrin®) (alpha-cyano- 3-phenoxybenzyl 2-(4-chlorophenyl)-3-methylbutyrate) were as or more toxic than methomyl to 4th instars of Trichoplusia ni (Hübner). All were more toxic than chlordimeform. Posttreatment temperature influenced toxicity with the pyrethroids having negative and methomyl and chlordimeform positive temperature coefficients of toxicity. In field tests, done when the highest temperature was 30°C WL 43775, WL 41706, and permethrin were as effective against cabbage loopers that attacked celery at 70 and 140 as methomyl at 840 g AI/ha. Residue studies indicated that the pyrethroids were more persistent than methomyl on celery with detectable residues of the former still present 21 days after treatment.

Document Type: Research Article

Publication date: August 1, 1978

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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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