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Dispersion of Grain Beetles (Coleoptera) in Grain Partially Treated with Insecticide

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Behavioral responses of Tribolium castaneum (Herbst) and Sitophilus oryzae L. to fenitrothion and of Rhyzopertha dominica L. to carbaryl and to bioresmethrin were tested by adding eggs (S. oryzae or R. dominica) or pupae (T. castaneum) to wheat unsprayed or sprayed with insecticide. Grain containing insects was placed above or below another layer of sprayed or unsprayed wheat so that insects could move freely between layers. The recommended application rate commonly used in Australia and a sublethal dosage of insecticide were tested. Numbers of live and dead adults and emigrants were counted. Carbaryl and fenitrothion did not affect insect movement, whereas bioresmethrin repelled R. dominica at concentrations of 0.25 and 1.0 mg/kg grain. Results indicated that, because of its repellent effect, less R. dominica than expected will be exposed to bioresmethrin. These results have implications for insecticide bioassay, population modeling, and in studies of the development of resistance.

Document Type: Research Article

Publication date: December 1, 1988

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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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