Toxicity to Face Fly and House Fly Larvae of Feces from Insecticide-Fed Cattle

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Abstract
Co-Ral® (O-(3-chloro-4-methylumbelliferone) O,O-diethyl phosphorothioate), Bayer 22408 (O,O-diethyl O-naphthalimido phosphorothioate), and ronnel were administered to Holstein heifers in the grain ration for 5 consecutive days to determine whether the treated animals would produce droppings that were toxic to the larvae of face flies (Musca autumnalis DeGeer) and house flies (Musca domestica L.). Tests in which the feces from the treated animals were infested with newly hatched larvae showed that Co-Ral and Bayer 22408 completely inhibited the development of face fly larvae at dosages of 1.0 and 0.5 milligrams per kilogram of animal weight. House fly larvae failed to survive at the 1.0 mg./kg. dosages of both chemicals. The 0.5 mg./kg. dosages were highly effective, but did not completely stop house fly development. Feces from animals fed ronnel at 5.0 mg./kg. gave complete kill of face fly and house fly larvae. Ronnel at 2.5 mg./kg. was effective against the larvae of face flies, but not house flies.