Abstract
Topical and residual LD50dosages of selected organophosphates inhibited cholinesterase of red flour beetles, Tribolium castaneum (Herbst), to widely different levels in both knockdown and survivor beetles. A relationship appears to exist between cholinesterase levels in both knockdown and survivor beetles and time of knockdown after topical treatment with tepp, malathion, and dicrotophos. The in vivo recovery rate of dicrotophos-inhibited cholinesterase was about 4% per day.
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