House Fly Control Studies in Chatham County, Georgia1

In 1957, residual applications of chlorinated hydrocarbons and organophosphorus compounds and insecticide impregnated cord installations were evaluated in Chatham County, Georgia, for control of house fly populations. EPN:DDT suspensions (25:200 mg./sq. ft.) provided satisfactory fly control for 3 to 7 weeks, an EPN :sugar suspension (25:62.5 mg./sq. ft.) failed to provide control, and a DDT suspension (200 mg./sq. ft.) gave excellent to satisfactory control for 8 weeks. Dow ET-57 (sampled as Dow ET-14) emulsions and suspensions produced acceptable control for 9 to 11 weeks (200 mg./sq. ft.) and for 4 to 5 weeks (100 mg./sq. ft.). A Dipterex:sugar water solution 200:500 mg./sq. ft.) yielded excellent control for 10 weeks at one dairy but was effective for only 2 weeks at a second dairy. Re-treatment of the latter dairy provided 6 weeks of satisfactory control. Emulsions of malathion: DDT: sugar; Guthion: sugar; General Chemical Compound 3707; or suspensions of lindane or methoxychlor failed to give control. Parathion-impregnated cotton cords (3/32”diameter), Diazinon-impregnated cords (⅛” or 3/16” diameter) and parathion-Diazinon treated cords (3/32” diameter) provided excellent to satisfactory fly control in dairy barns and a chicken ranch, for periods of approximately 9 to 15 weeks.