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Status of Malathion Resistance in Five Genera of Beetles Infesting Farm-Stored Corn, Wheat, and Oats in the United States

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More than 100 strains of Tribolium castaneum (Herbst), Rhyzopertha dominica (F.), Sitophilus spp., Cryptolestes spp., and Oryzaephilus spp., were collected from grain bins on farms in 14 grain-producing states. These were screened for resistance to malathion by the discriminating dose technique, using impregnated filter papers. Measurable tolerance occurred in 31 of 36 strains of Tribolium 11 of 13 strains of Rhyzopertha, 7 of 22 strains of Sitophilus, 5 of 42 strains of Cryptolestes, and none of 13 strains of Oryzaephilus. Resistance was widespread and severe only in Tribolium castaneum. Fifteen of the T. castaneum strains were tested further, and all achieved resistance levels of >20-fold after a single selection. Resistance in this species was largely or completely suppressed by triphenylphosphate in all 13 strains tested.

Document Type: Research Article

Publication date: August 1, 1983

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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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