The Susceptibility of House Flies Reared under Various Photoperiods to Insecticide Residues1

Abstract
Tests were conducted to determine the relative susceptibility of the house fly, Musca domestica L., reared under 7 photoperiods to residues of DDT, endrin, and dieldrin. Flies reared under Light-Dark (LD) 14:10 photoperiod were the most consistent in susceptibility to film residues of each of the 3 insecticides. Those reared under LD 13:11 also were susceptible to endrin residues. Flies reared under LD 15:9 were the least susceptible to DDT and dieldrin.

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