Organic Phosphorus Compounds for the Control of Resistant House Flies in Dairy Barns1

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Abstract
At Savannah, Georgia, in 1956, residual applications of diazinon to dairy barns at a rate of 100 mg/sq. ft. alone or with sugar (250 mg/sq. ft.) gave 6 to 8 weeks of satisfactory control. At the rate of 20 mg/sq. ft., diazinon without sugar failed to provide control but with sugar (50 mg/sq. ft.) produced 4 weeks of satisfactory reduction. A dipterex-water solution applied at the rate of 100 mg/sq. ft. gave 3 weeks of satisfactory control compared with 8 weeks of control obtained with a Dipterex:sugar formulation (100:250 mg/sq. ft.). Parathion:DDT emulsion formulations at the rate of 10:200 mg/sq. ft. gave control ranging from 1 to 7 weeks. A parathion: sugar emulsion treatment at the rate of 10:250 mg/sq. ft. produced only 1 week of excellent control. A single test with an EPN:DDT suspension at a rate of 25:200 mg/sq. ft. gave excellent control for the entire 13-week evaluation period. Dow ET-15 emulsion applied late in the season at the rate of 200 mg/sq. ft. provided excellent control for the 9-week evaluation period.

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