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Toxicity, Penetration, Excretion, and Metabolism of Carbofuran in Larvae of the Tobacco Budworm and the Corn Earworm (Lepidoptera: Noctuidae)

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The fate and toxicity of carbofuran applied topically to larvae of the tobacco budworm, Heliothis virescens (F.), and the corn earworm, Helicoverpa zea (Boddie), were determined. Carbofuran was most toxic to the earliest instars and least toxic to the fifth instar, and more toxic to H. zea than to H. virescens. Carbofuran penetrated the cuticle of the corn earworm more readily than that of the tobacco budworm in both the third and fifth instars, which corresponded with the toxicity shown. The in vivo metabolism of carbofuran was studied by injecting the insecticide into H. virescens and H. zea larvae. Overall, rate of excretion of carbofuran was higher in H. zea than in H. virescens; however, H. virescens metabolized earbofuran more readily than H. zea. The three metabolites identified in both H. uirescens and H. zea were 3-hydro:\)' carbofuran, 3-keto carbofuran, and 3-keto carbofuran phenol, similar to those reported in mammals, plants, and other insects.

Document Type: Research Article

Publication date: April 1, 1995

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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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