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Comparison of Four Organophosphorus Insecticides on Stored Wheat for Control of Susceptible and Malathion-Resistant Strains of the Red Flour Beetle

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Aqueous formulations of malathion, bromophos, iodofenphos, and pirimiphos-methyl were each applied to dry (12.0% moisture content) and tough (16.0% moisture content) wheat at 2 dosage levels to compare their persistence and effectiveness on susceptible and malathion-resistant strains of Tribolium castaneum (Herbst). Bio- and chemical assays of the insecticides by using GLC were conducted at intervals over a 24-wk period.

Pirimiphos-methyl at 4 and 6 ppm was the most effective compound during the 24 wk against both strains of T. castaneum and prevented reproduction. Malathion at 8 and 12 ppm was ineffective against the resistant strain. Residue analysis revealed that pirimiphos-methyl was the most stable compound followed by bromophos, malathion, and iodofenphos. The residual effectiveness of bromophos and iodofenphos in stored grain and their low mammalian toxicities demonstrate that these compounds are promising alternatives to malathion. They can be used as short-term residual grain protectants against infestations. Pirimiphosmethyl may prove to be a useful grain protectant for long term storage against susceptible and resistant strains of stored grain insects.

Document Type: Research Article

Publication date: June 1, 1979

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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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