Toxicity to House Flies and Horn Flies of Manure from Insecticide-Fed Cattle

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Abstract
In feeding tests extending 91 days, 0.5 and 1 mg./kg./day of Co-ral® ( O, O -diethyl 0-3-chloro-4-methyl-2-oxo-HI-l-benzopyrnn-7-yl phosphorothioate) and 1 mg./kg./day of Bayer 2:2408 ( O, O -diethyl O-naphthalimido phosphorothioate) were essentially 100% effective in preventing development of larvae of horn flies, Haematobia irritans (L.), and partially effective against house flies, Musca domestica L., in manure of cattle. In 10-day feeding tests with 10 insecticides, Bayer 37341 ( O, O -diethyl 0-(4-methylthio-3,5-xylyl) phosphorothioate) at 5 mg./kg./dny, Bayer 37342 ( O, O -dimethyl 0-4-(methylthio)-3,5-xylyl phosphorothioate) at 10 mg./kg./day, and General Chemical 4072 (2-chloro-l-(2,4-dichlorophenyl) vinyl diethyl phosphate) at 2.5 mg./kg./day were effective against both species. Famophos ( O, O -dimethyl O-p -(dimcthylsulfamoyl)phenyl phosphorothioate) at 10 mg./kg./day, V-C 13 Nemacide® ( O -2,4-dichlorophenyl O, O -diethyl phosphorothioate) at 3 mg./kg./day, and Bayer 29493 ( O, O -dimethyl O -[4-(methylthio)-7ll-tolyl] phosphorothioate) and Stauffer R-1504 ( O, O -dimethyl S -phthalimidomethyl phosphorodithioate) both at 2.5 mg./kg./day, were effective against horn flies but only partially so against house flies.

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