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Ovicidal Activity and Alteration of Octopamine Titers: Effects of Selected Insecticides on Eggs of the Tobacco Budworm (Lepidoptera: Noctuidae)

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Abstract:

The formamidines chlordimeform (CDF), desmethyl-CDF, BTS-27271 (NOR-AM 49844) and amitraz; the pyrethroid lambda-cyhalothrin; and the carbamate thiodicarb were evaluated for ovicidal activity and effects on octopamine titers in eggs of the tobacco budworm, Heliothis virescens (F.). CDF and lambda-cyhalothrin were the most toxic of the compounds examined, followed by desmethyl-CDF and BTS-27271. Although octopamine is not detectable in untreated eggs of H. virescens, three formamidines caused the appearance of octopamine in treated eggs. lambda-cyhalothrin, amitraz, and thiodicarb had no apparent effect on octopamine titers. In vivo metabolism studies of radiolabeled amitraz by eggs of H. virescens indicate that BTS-27271 is a likely metabolite. Because octopamine is involved in insect behavior and energy mobilization, the formamidine-induced alteration of octopamine titers might alter behavioral responses or energy availability during the critical hatching process leading to increased mortality.

Document Type: Research Article

Publication date: April 1, 1993

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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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