Abstract
Long dash]DDT and DDT plus WARF Antiresistant were applied topically to DDT-resistant and DDT-susceptible strains of house flies (Musca domestica L.). An LD50 value of 10.5 [mu]g per fly was obtained with the DDT-resistant strain with DDT plus WARF Antiresistant whereas no mortality was obtained at dosages as great as 66.0 ug per fly with DDT alone. DDT plus WARF Antiresistant was slightly more toxic to the susceptible strain than DDT alone.

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