Adult House Fly Control with Residual Treatments of Six Organophosphorus Compounds1

Abstract
Dimethoate, DDVP, General Chemical 4072 (O-O-diethyl-1-(2,4-dichlorophenyl)-2-chlorovinyl diethyl phosphate), and Bayer Compounds 29493(O, O-dimethyl O-[4-(methylthio)-m-tolyl] phosphorothioate), 34098 (O-(4-methylthio-m-tolyl dimethylphosphinothioate), and 22408 (O, O-diethyl O-naphthalimido phosphorothioate) were evaluated as residual treatments in Savannah, Georgia, dairy farms for the control of house fly (Musca domeslica L.) populations. Bayer 22408 (100 mg./sq. ft.) with or without sugar and DDVP (100 mg./sq. ft.) with a sugar additive failed to provide satisfactory residual deposits. At five dairies, Bayer 29493 (100 mg./sq. ft.) provided 6 to 15 weeks of excellent to satisfactory control while Bayer 34098 (100 mg./sq. ft.) and G. C. 4072 (50 mg./sq. ft.) at a single dairy gave 15 to 16 weeks of satisfactory control. Dimethoate (200 mg./sq. ft.) provided 9 to 16 weeks of effective fly control.

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