Abstract
Twenty-nine insecticides were active systemically when administered orally or subcutaneously to guinea pigs parasitized by larvae of the black blow fly, Phormia regina (Meigen), and the secondary screwworm, Cochliomyia macellaria (F.), by nymphs of the lone star tick, Amblyomma americanum (L.), and by adult stable flies, Stomoxys calcitrans (L.). When these 29 insecticides and 12 previously tested insecticides were administered orally by capsule or dermally as sprays to cattle, the following oral treatments gave >90% control of cattle grubs, Hypoderma spp.: CIBA C-9491 ( O -(2,5-dichloro-4-iodophenyl) O, O -dimethyl phosphorothioate) (50 mg/kg), CIBA C-11044 ( O -(2,5-dichloro-4-iodophenyl) O -ethyl O -methyl phosphorothioate) (100 mg/kg), and Hercules 18009 ( O, O -dimethyl phosphorodithioate S -ester with 1-acetyl-3-(mercaptomethyl) hydantoin) (5 mg/kg).
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