Abstract
Studies on boll weevil ( Anthonomus grandis Boheman) resistance to the chlorinated hydrocarbon insecticides were conducted in the laboratory on weevils collected from 16 counties in Georgia. It was found that resistance to endrin was widespread in the State; only those weevils from the extreme northern counties were highly susceptible. Resistance to BHC and toxaphene was established. There was some indication of reversion to susceptibility to endrin from 1959 to 1960; however, little or no difference was found in the susceptibility of weevils following a change from field applications of chlorinated hydrocarbon to organic phosphate insecticides during 1961. Two years’ results showed field-collected weevils of unknown age to be 50 to 210 times harder to kill than 2-day-old square-reared weevils.
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