Further Evaluation of Animal Systemic Insecticides, 19662

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Abstract
Data are presented for 14 insecticides found systemically active in screening tests with arthropods parasitizing guinea pigs. Thirty-five insecticides were administered to small groups of cattle, and the following treatments afforded forded >90%systemic control of cattle grubs, Hypoderma spp.: Bay 37342 (O,O-dimethyl O.[4-(methylthio)-3,5-xylyl) phosphorothioate) as 0.1 and 0.25% sprays (22 and 50 mg/kg); bromophos-ethyl, 15 mg per kg by capsule; fenthion as 0.05, 0.1, and 0.25% sprays (12, 20, and 50 mg/kg); Imidan® (O,O-dimethyl S-phthalimidomethyl phosphorodithioate) in feed for 10 days at 1.5 and 2 mg per kg per day and as a 0.25% spray (50-55 mg/kg); menazon in feed for 10 days at 2.5 and 5 mg per kg per day, as 0.5 and 0.75% sprays (100 and 155 mg per kg), and as a pour-on of 15% in oil (100 mg/kg); Shell SD-8447 (2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate) as a pour-on of 16% in oil (100 mg/kg)-and as 3 applications of 0.5% spray (115 mg per kg; Shell SD-8448 (2-chloro-1-(2,4,5-trichlorophenyl) vinyl diethyl phosphate) as a 1% spray (145 mg/kg); and Stauffer R-3828 (S-(P-chloro-alpha-phenylbenzyl) O,O-diethyl phosphorodithioate) in feed at 2.5 mg per kg per day for 10 days.

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