Temperature Effects on Toxicity of Synergized Carbamate Insecticides on House Flies

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Abstract
Carbaryl, Pyrolan® (3-methyl-1-phenyl-5-pyrazolyl dimethylcarbamate) and N-methyl m-isopropylphenyl carbamate (IPC) are slightly more toxic to house flies, Musca domestica L., at 30° than at 20° (positive temperature coefficient) in the absence of synergists. When large doses of scsamex or of the selective amine synergists 2,4-dichloronaphthoxyethyl diethylamine and 2,4,6-trichlorophenoxyethyl diethylamine are applied, the toxicity of all 3 carbamates is greatly increased but the temperature coefficient becomes zero or slightly negative. Flies reared from the early pupal stage at 20° are somewhat more resistant to synergized carbaryl and IPC, but not to Pyrolan, than flies reared at 30°.