Effects of Adult Western Corn Rootworm (Coleoptera: Chrysomelidae) Ear Feeding on Irrigated Field Corn in Colorado

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Effects of adult western corn rootworm, Diabrotica virgifera virgifera LeConte, feeding on corn yield were assessed over a 4-year period by confining beetles in various densities to corn ears. Corn rootworm survival was good under conditions of the study and generally resulted in a direct positive correlation between beetle number and superficial injury. However, analysis of yield parameters (kernel weight, and kernel number per ear quarter and per ear) indicated that densities of up to 20 beetles per ear did not significantly reduce yield. Some evidence of compensation was observed, with the tip quarter of the ear often exhibiting a positive linear response to beetle density, and the other ear quarters exhibiting nonlinear responses. Similarly, mechanical defoliation studies suggested that moderate levels of silk clipping could be tolerated.

Document Type: Research Article

Publication date: December 1, 1986

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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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