Abstract
Four pesticides were tested near Ithaca, New York, against larvae of the black fly, Simulium pictipes Hagen. The 4 were, Abate® (O,O -dimethyl phosphorothioate O,O -diester with 4,4'thiodiphenol), Dursban® (O,O -diethyl O- (3,5,6-trichloro-2-pyridyl) phosphorothioate), ronnel. Korlan® (a 24% emulsifiable concentrate of ronnel), and methoxychlor. Dursban in all formulations tested was at least 10 times more effective as a killing agent than the other pesticides Abate was intermediate in effectiveness followed by methoxychlor, Korlan, and ronnel. Wheat flour and brewer’s yeast formulations were about equal in effectiveness to the standard commercial formulations. Only methoxychlor was effective as a detaching agent. In concentration-time trials both Dursban and methoxychlor were much more effective at low concentrations and long exposure times than with the same total pesticide applied with high concentrations and low exposure times.
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