Feeding of Coumaphos, Ronnel, and Rabon to Dairy Cows: Larvicidal Activity Against House Flies1 and Effect on Insect Fauna and Biodegradation of Fecal Pats2

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Eight dairy cows 2/treatment, were fed a concentrate-alfalfa hay pellet-corn silage ration supplemented as follows (1) no insecticide, (2) 56 ppm coumaphos, (3) 56 ppm RabonĀ® (2-ehloro-1-[2,4,5-trichlorophenyl] vinyl dimethyl phosphate), or (4) 112 ppm ronnel. Larvicidal activity against Musca domestica L. was significantly greater in feces from cows fed Rabon than in feces from cows fed either coumaphos or ronnel. Milk from cows fed coumaphos or Rabon contained no residues (<0.005 ppm), however, residues were detected in milk from cows fed ronnel.

Feces examined after 6 or 9 weeks in a pasture showed no difference between the biodegradation of untreated and treated feces except that little tunneling was observed in the pats containing coumaphos. This tunneling was apparently done by larvae of soldier fly, Sargus cuparius (L.).

Document Type: Research Article

Publication date: October 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.
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