Abstract
Occurrence of DDT resistance in the codling moth, Carpocapsa pomonella (L.), is briefly reviewed. A strain of codling moth from an apple orchard at Soquel, California, is shown by laboratory studies to have an LC-50 four times that of a nonresistant laboratory strain. These studies are based on the susceptibility of newly hatched larvae of each strain to initial deposits from different dosages of a DDT wettable powder on apples, using a cell technique. Well-timed applications of DDT in replicated plots in the orchard in which the resistant population occurred resulted in control failure, whereas materials not related to DDT provided excellent control.
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