Toxicity to House Fly Larvae of Droppings from Chickens Fed Insecticide-Treated Rations1

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Abstract
The toxicity to house fly (Musca domestica L.) larvae of feces from chickens on a continuous dietary regimen of laying ration containing- Co-Ral® (O-(3-chloro-4-methylumbelliferone) O, O- diethyl phosphorothioate), Diazinon® (O,O-diethyl O-(2-iso- propyl-4-methyl-6-pyrimidinyl) phosphorothioate), Dipterex® (O,O-dimethyl 2,2,2-trichloro-1-hydroxyethylphosphonate), malathion, phenothiazine ronnel , and Dow ET-15 (O-methyl O-(2,4,5-trichloropenyl) phosphoramidothioate) was investigated. The insecticide levels in the feed that caused greater than 90% mortality in larvae placed in the manure were: Co-Ral, 89 p.p.m.; Diazinon, 154 p.p.m.; Dipterex, 89-132 p.p.m.; ronnel, 176-220 p.p.m.; and Dow ET-15, 89 p.p.m. Feces from chickens on malathion- and phenothiazine-treated rations caused relatively low mortality in the larvae at concentrations as great as 1,102 p.p.m. and 11,023 p.p.m., respectively.

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