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The effects of administering technical SD-8211 (2-chloro-1-(2,5-dichlorophenyl) vinyl dimethlyl phosphate) and SD-8280 (2-chloro-1-(2,4-dichlorophenyl) vinyl dimethyl phosphate) at concentrations of 50, 200, and 800 ppm in the feed of laying hens for 1 year were studied. The mean daily intake of actual insecticide per hen was estimated as 22.214.171.124, and 8-1-2 mg for those receiving 50, 200, and 800 ppm of SD-821, respectively, and 5.3, 20.8, and 80.3 mg for those receiving 50, 200, and 800 ppm SD 8280, repectively. More effective fly control was obtained in droppings from SD-8280-treated hens than from SD8211-treated hens. Levels as low as 50 ppm resulted in moderate control of the house fly. Musca domestica L, and a flesh fly, Boettcherisca peregrina(Robineau-Desvoidy), but at least 200 ppm were required for good control of these species and moderate control of an anthomyid, Fannia pusio(Wiedemann); a blow fly, Chrysomya megacephala(F.); and a flesh fly, Parasarcophaga argyrostoma (Robineau-Desvoidy). No hen mortality occurred that could be attributed to insecticidal treatment, but there was an inhibiting effect on blood plasma cholinesterase activity related to insecticidal concentration. Egg production was slightly lower in hens fed 800 ppm SD-8280 than in the control hens. However, overall feed consumption, body weight, feed efficiency, egg weight, interior egg quality, shell thickness, egg flavor, and egg odor were normal in all treated hens.
Document Type: Research Article
Publication date: February 1, 1973
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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.