Response of the House Fly and its Parasitoids to Dimilin (TH-6040)12

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Abstract
Field and laboratory studies were conducted to determine the effects of Dimilin® (1-(4-chlorophenyl) -3- (2,6- difluorobenzoyl)-urea) on Musca domestica L. and some of its parasitoids. In the laboratory, applications of Dimilin at 10,000, 100, 50, and 10 ppm had no observable effects on house fly eggs nor did the chemical affect fly pupae. Concentrations of 10, 2.5, and 1.25 ppm AI produced over 90% mortality in intermediate to late stage larvae. Dimilin had no observable effects on the emergence of the parasitoid Muscidifurax raptor Cirault and Sanders from parasitized fly pupae, nor was the parasitoid’s ability to parasitize hosts affected. When compared with dimethoate to control flies on poultry farms, the Dimilin-treated farm favored populations of parasitoids, i.e., had greater parasitoid abundance and species diversity.

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