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Western Corn Rootworm:1 A Ten-Year Study of Potential Resistance to Diazinon and Phorate in Nebraska2

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Adults of Diabrotica virgiferaLeConte were collected annually from 1963 through 1972 from 18 specific sites in Nebraska and treated with a series of concentl'l1tionsof diaziuon and phorate to determine annual median lethal dose values. Dosage-mortality curves or regression lines were statist- ically determined from the annual median lethal dose data. Although the median lethal dose values for both insecticides increased from 1963 to 1972, neither regression line is significant. However, the median lethal dose data for diazinon significantly fit a quadratic curve, indicating possible reversion in susceptibility to diazinon. Predictions of imminent resistance in the field based on the slopes of the regression lines would be speculative.

Document Type: Research Article

Publication date: October 1, 1973

More about this publication?
  • 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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