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Residual and Topical Toxicity of Various Insecticides to the Lesser Mealworm (Coleoptera: Tenebrionidae)

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Experiments were conducted to determine the relative toxicities of seven insecticides to adult and late instar lesser mealworms and to compare the residual activity of permethrin and carbaryl on polystyrene and unpainted plywood. In the residual activity tests, insecticide performance was altered by differences in formulation, surface type, and life stage of the insect. Wettable powder formulations were more effective on polystyrene than were emulsifiable concentrate formulations. Residual activity of permethrin and carbary1 was longer and more effective on polystyrene surfaces than on unpainted plywood. Tetrachlorvinphos WP (0.50% AI) gave excellent control on both surfaces. In the topical application experiments, permethrin, famphur, and tetrachlorvinphos were most toxic. Dimethoate, tetrachlorvinphos, carbaryl, and propoxur were more toxic to late instars than to adults. The reverse was true for malathion. Protection administered to polystyrene insulation by surface sprays may be nullified by the burrowing habits of the insect. Toxicity profiles of different mealworm populations may depend on different spray regimes within poultry houses.

Document Type: Research Article

Publication date: February 1, 1984

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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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