The literature is voluminous on the effectiveness of DDT and other insecticides as residual larvicides against the bollworm, Heliothis zea (Boddie), but little or no information is available on their effect on the adults. Robertson (1948) reported that control of pink bollworms, Pectinophora gossypiella (Saunders) with DDT dust was obtained principally by the insecticidal action of this material against the adults, since it caused a reduction in the number of eggs produced. In a recent laboratory study, Adkisson and Wellso (1962) found that not only was DDT an efficient killer of adult pink bollworms, but the longevity and fecundity of moths surviving exposure to low dosages of this insecticide were significantly reduced as compared with the same factors in moths from the untreated controls. These workers attributed the reduction in oviposition of the treated adults to a lowered incidence of mating, shortened lifespan, and other undetermined physiological effects resulting from exposure to DDT. In view of the importance of insecticidal action against the adult stage in reducing pink bollworm populations, an experiment was conducted between September 1 and 4, 1964, to evaluate the effectiveness of certain insecticides against bollworm moths on cotton. The insecticides tested, carbaryl, DDT, and methyl parathion, are usually recommended for control of bollworm larvae on cotton.
Document Type: Research Article
Publication date: October 1, 1965
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