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In 1961, coumaphos (Co-RaI®) 50% oral drench powder in capsules at dosages of from 0.5 to 25 mg/kg was fed to laying white leghorn hens for 7 or 10 days. Dosages over 5 mg/kg caused considerable loss of weight and reduction in egg laying. At the 25 mg/kg level, all birds died. Analyses of tissues from treated birds showed no residues in excess of 1 ppm (the established tolerance). However, residues up to 0.09 ppm were recovered from egg yolks. In 1962, colony houses, 10X12 ft, containing laying white leghorn hens were treated as follows: 2 houses received a 5% dust at the rate of 2 oz/30 ft2 of floor space; 2 houses were fogged, using a Halaby fogger, with a suspension of coumaphos 25% wettable powder at essentially the same dosage used in dusted houses. Less than 0.15 ppm coumaphos were found in liver and fat of the exposed birds. The dust application resulted in no detectable residues of coumaphos in egg yolks. In one instance, a marginal residue of 0.03 was found in eggs from birds exposed to fogging.
Document Type: Research Article
Publication date: August 1, 1964
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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.