Joint Action of DDT and Other Chlorinated Hydrocarbon Insecticides against Resistant Boll Weevils1

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The joint action of DDT in combination with toxaphene, endrin or lindane against boll weevils (Anthonomus grandis Boh.) differing in susceptibility, to the individual insecticides was studied in the laboratory. Weevils were treated topically, or exposed to a residual film for mortality studies. These were either laboratory reared or field collected. Penetration and metabolism of DDT was studied when applied alone or in mixtures with other insecticides.

Mixtures of insecticides exhibited additive effects only for boll weevils susceptible to chlorinated hydrocarbon insecticides. However, when weevils resistant to these insecticides were used, the mixture of toxaphene-DDT exhibited synergistic effects. Mixtures of endrin-DDT and lindane-DDT exhibited additive effects only.

Penetration of DDT appeared to be equal for both strains. Separate applications of toxaphene and DDT to different sites of the weevil were as effective as a single application of the mixture. DDT applied as late as 96 hours subsequent to an application of toxaphene resulted in high mortality of the weevils. However, repeated applications of toxaphene failed to give much of an increase in mortality.

Weevils did not metabolize DDT as rapidly when treated with the mixture as when treated with DDT alone. The metabolism of toxaphene is unknown.

Although the toxaphene-DDT mixture exhibits synergistic activity against resistant boll weevils, the combination was not as effective against resistant boll weevils as toxaphene alone against susceptible boll weevils.

Document Type: Research Article

Publication date: June 1, 1959

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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