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The Penetration and Metabolism of C14-Labeled DDT in Resistant and Susceptible Tobacco Budworm Larvae, Heliothis virescens (F.)

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The fate of C14-labeled DDT applied topically to larvae of the tobacco budworm, Heliathis virescens (F.), was determined in several DDT-resistant and susceptible strains. The DDT did not penetrate effectively the cuticle of the older 5th-instal larvae, The same phenomenon occurred in the 3rd-instar larvae of the South Delta resistaant strain. In the other resistant strain the DDT penetrated effectively the cuticle but was degraded rapidly and climinated.

The resistant South Delta strain when fed a diet of colton Ieaves was susceptible to a topically applied dose of DDT which readily penetrated the cuticle. This diet, altered strain resembled one of the susceptible strains in the rate of penetration and climination of the dose as well as having a similar LD50 for DDT. The other susceptible strain showed DDT breakdown but was ineffective in reducing the DDT content interllally owing to the rapid DDT absorption in conjunction with slow excretion of the dose.

In all strains where DDT breakdown occurred both DDE and DDA were found, with the DDA increasing in the excreted fraction.

Document Type: Research Article

Publication date: June 1, 1966

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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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