Impact on Colonies of Honey Bees1 of Ultra-Low-Volume (Undiluted) Malathion Applied for Control of Grasshoppers2,3

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When the effects on honey bees, Apis mellifera L., of Large-scale aerial applications of ultra-low-volume (undiluted) malathion (8 fluid oz per acre) were studied in Wyoming, the bees dead from the malathion were recovered in special hive-entrance traps for 7 days. Residues were detected in alfalfa (12-29 ppm), in pollen (0.43-11.1 ppm), and in dead bees (<0.01-0.37 ppm) for as long as 8 days after the application

Covering hives with burlap covers for 2, 4, and 5 days provided some protection, but an unanticipated exposure to the insecticide before the covering was put in place prevented a full evaluation of this protective technique.

Damage to colonies was more severe when nectar-flow conditions were good than during periods of nectar dearth. The impact was also less in colonies with abundant brood, pollen, and honey in the hives.

Document Type: Research Article

Publication date: February 1, 1968

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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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