Control of the Face Fly on Cattle with Co-Ral in Grain and on Pasture1

Publisher Website
Google Scholar
Abstract
Co-ral® (O, O-diethyl O-3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl phosphorothioate) was fed daily to cattle in a grain ration for 6 weeks at a rate of 0.5 mg./kg. of animal weight. In another test, a 16-acre pasture was sprayed six times at weekly intervals with Co-ral at a rate of 37.02 grams of active ingredient per acre. The feces from cattle eating the treated grain and the sprayed grass were sufficiently toxic to face fly (Musca autumnalis De Geer) larvae to completely inhibit development. The toxicity to the larvae was determined by bioassay twice weekly. There was no apparent reduction in the number of face flies on the cattle during these studies. Bioassays of the feces were also made with house fly (Musca domestica L.) larvae as a test insect. Co-ral in grain and as a spray on grass eaten by cattle gave approximately 54% and 71% reduction, respectively, in the number of house fly larvae that developed to adults.

This publication has 1 reference indexed in Scilit: