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Effects of Corn Phenology on Spatial Distribution and Population Estimation of Adult Northern Corn Rootworms (Coleoptera: Chrysomelidae)

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The spatial distribution of adult Diabrotica longicornis barberi Smith and Lawrence in a Quebec cornfield varied with host phenology. The initial distribution in the second half of July was "contagious"; distribution was random during the first 2 weeks of August when the crop was in full bloom. Distribution was again "contagious" when most of the corn silks dried up after mid-August. Concurrent with changes in beetle distribution, numbers of corn plants necessary for population estimation with a particular precision level changed as the season progressed. During the second week of August when the population peaked, approximately 40% of the beetles were found inside the axils of leaves, and from 40 to 50% on silks and ear-tips. During this period, beetle counts on 40 randomly selected plants give a reasonably accurate estimate of the field population, with a standard error of less than 10% of the mean.

Document Type: Research Article

Publication date: October 1, 1984

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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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