Abstract
Abstract Toxicities to the red crawfish were determined for 10 insecticides considered for use in controlling the forest tent caterpillar or being used to control rice and sugar cane insects. Malathion, dimethoate, and Mirex were not toxic to crawfish at concentrations effective in large-scale insect control projects. The seven insecticides found to be toxic to crawfish, listed in order of the lowest 24-hour and 72-hour median tolerance limits (TLm), were methyl parathion, endrin, DDT, sevin, Bidrin, Dibrom, and phosphamidon. Methyl parathion was found to remain toxic in water to crustaceans for over 1 month. Bidrin and phosphamidon were effective in controlling the forest tent caterpillar in extensive forested areas at levels approximately 100 times lower than the 24-hour TLm for red crawfish.
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