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Persistence and Uptake in Wheat of Malathion and Bromophos Applied on Granary Surfaces to Control the Red Flour Beetle

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Malathion EC and bromophos wp were diluted with water and applied at 0,05 liter/m2 to provide a deposit of one g/m2 AI on concrete, metal, fir plywood, and maple hardwood floor surfaces in a farm granary. The rate of uptake of each insecticide in wheat, in contact with the treated hardwood floor, was determined by analysis of core samples. Insecticide persistence on treated surfaces was assessed by 24-h exposures of adults of Tribolium castaneum (Herbst) from 1–40 wk after treatment. Both insecticides provided 100% mortality on metal surfaces for 40 weeks. Malathion provided 100% mortality on fir plywood for 40 wk and on the maple hardwood floor for 4 weeks. Bromophos provided 100% mortality on fir plywood for 18 wk and on the maple hardwood floor and concrete for 4 weeks.

Malathion showed no increased uptake in stored wheat after 4 wk but bromophos showed increased uptake from 0.28 ppm after 18 wk storage to 0.47 ppm after 40 weeks. The experiments indicated that malathion and bromophos need not be applied as frequently to granary surfaces of metal and wood as to those of concrete.

Document Type: Research Article

Publication date: June 1, 1976

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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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