Emergence of the Western and Northern Corn Rootworms (Coleoptera: Chrysomelidae) from Four Tillage Systems

Authors: GRAY, M. E.; TOLLEFSON, J. J.

Source: Journal of Economic Entomology, Volume 81, Number 5, October 1988 , pp. 1398-1403(6)

Publisher: Entomological Society of America

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Emergence of the western corn root worm (WCR), Diabrotica virgifera virgifera LeConte, and northern corn root worm (NCR), D. barberi Smith and Lawrence, was evaluated in four tillage systems near Ames, Iowa, from 1983 through 1985. Linear regression equations (y = a + bx) and coefficients of determination (R2) are presented that describe cumulative emergence (y) (probit scale) on Julian date (x) for both species in each tillage system. Initial emergence generally was delayed in conservation tillage treatments for the WCR. The rate of WCR emergence in these tillage systems was greater, however, than in more conventional practices. Because of increased rates of WCR emergence from conservation tillage practices, cumulative beetle emergence by mid-August through early September is comparable among tillage treatments despite delayed emergence associated with conservation practices. Emergence of NCR was less affected by tillage.

Document Type: Research Article

Publication date: October 1, 1988

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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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