Toxicity of General Chemical Compounds 3582, 3583, and 4072 to Screw-Worms in Laboratory and Field Tests1

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Abstract
Three organophosphorous compounds, General Chemical 3582 (l-(2,5-dichlorophenyl)-2,2-dichlorovinyl diethyl phosphate), 3583 (2-chloro-l-(2,5-dichlorophenyl)vinyl diethyl phosphate), and 4072 (2-chloro-l-(2,4-dichlorophenyl)vinyl diethyl phosphate), evaluated as in vitro toxicants against screw-worms (Callitroga hominivorax), compared favorably with standard insecticides. In tests with artificially infested sheep and cattle all three compounds were toxic to 1-, 2-, 3-, and 4-day-old larvae and prevented reinfestation for a minimum of 24 hours. Sprays with 0.25% of General Chemical 4072 applied to sheep and goats in 4 small field tests appeared to be more effective than the standard.

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