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Influence of Tillage and Western and Northern Corn Rootworm (Coleoptera: Chrysomelidae) Egg Populations on Larval Populations and Root Damage

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Influence of tillage systems on larval populations and root damage was examined for western (WCR) and northern (NCR) corn rootworms, Diabrotica virgifera virgifera LeConte and Diabrotica barberi Smith & Lawrence, respectively. Based on absolute estimates of WCR and NCR spring egg populations, larval populations and root damage were lower than expected in the no-till treatment relative to other tillage treatments. Root weights were least in the no-till regime. Ratio of WCR to NCR eggs (x) was an important factor in establishment of larval populations (y) according to the linear relationship: (y = 1.80 + 5.45x; R2 = 0.76; n = 12; P < 0.0002). Rootworm populations composed primarily of NCR are less capable of causing root damage compared with a population of WCR. The following linear regression equation was calculated to describe the relationship between WCR and NCR egg ratio (x) and root damage (y): (y = 1.56 + 1.29x; R2 = 0.71; n = 12; P < 0.0006).

Document Type: Research Article

Publication date: August 1, 1987

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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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