Insecticide Toxicity in European Corn Borer (Lepidoptera: Pyralidae): Ovicidal Activity and Residual Mortality to Neonates

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Abstract:

Field and laboratory studies were conducted using selected carbamate, organophosphate, and pyrethroid insecticides to quantify their toxicity to European corn borer, Ostrinia nllhilalis (Hübner), eggs and residual mortality to neonates. Field studies included most insecticides currently registered for Q. nubilalis on vegetable crops, as well as recently developed pyrethroids. Insecticides with the greatest ovicidal activity in field trials, in decreasing order, included methomyl, encapsulated methyl parathion, permethrin, thiodiearb, zeta-cypermethrin, and lambda-cyhalothrin. With the exception of methomyl, significant larval mortality was also observed for each material. Of all materials tested, only methomyl previously was assumed to have ovicidal activity on O. nubilalis. Laboratory bioassays were conducted to estimate the LC50 for insecticides showing the greatest ovicidal activity in the field. In with the greatest Ovicidal activity included, in decreasing order, zeta-c)1wnnethrin, lambda-cyhalothrin, permethrin, methyl parathion, esfenvalerate, and methomyl. With the exception of methomyl, all insecticides demonstrated high levels of residual toxicity to neonates. Ovicidal activity of methomyl in the field but low inherent toxicity to eggs in the laboratory bioassay was partially explained by the use of a higher field rate relative to the pyrethroids. Results from this study \~Il be useful for improving the timing of insecticide applications against O. nubilalis and necessary for refinement of an O. nubilalis management model.

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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