The Penetration and Metabolism of C14-Labeled DDT in Resistant and Susceptible Tobacco Budworm Larvae, Heliothis virescens (F.)1

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Abstract
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.

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