Development of Insecticide Resistance in Three Field Strains of House Flies

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Abstract
House flies (Musca domestica) from three dairy barns in central Florida were collected at intervals from 1954 to 1960, reared to the F1 or F2 generations in the laboratory, and tested for resistance to baits, contact sprays, and residues. Development of resistance to malathion was fairly rapid whereas that to Dipterex (O O-dimethyl 2,2,2-trichloro- 1-hydroxyethyl phosphonate) was somewhat slower. Resistance at the LC-50 level reached more than 275-fold to malathion in baits and 19- to 23-fold in contact sprays and reached 11- to more than 50-fold to Dipterex in baits, 12- to 29-fold in contact sprays, and 8-fold in residues.

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