Corn Rootworm (Coleoptera: Chrysomelidae) Larval Injury and Root Compensation of 12 Maize Hybrids: an Assessment of the Economic Injury Index
Authors: GRAY, MICHAEL E.; STEFFEY, KEVIN L.
Source: Journal of Economic Entomology, Volume 91, Number 3, June 1998 , pp. 723-740(18)
Publisher: Entomological Society of America
Abstract:A 4-yr field investigation (1993-1996) to examine the compensatory root regrowth of 12 commonly grown maize hybrids after larval injury by corn rootworms, Diabrotica spp., was conducted at 2 locations in Illinois. Root injury ratings, root volume measurements taken in July and August, and root regrowth parameters were evaluated for their usefulness in predicting yield. Root ratings were as useful as root volumes and root regrowth measurements in predicting yield. Large root systems in July and August generally were positive factors contributing to yield; however, compensatory root regrowth, particularly when soil moisture was adequate, negatively affected yield. Root regrowth after larval injury typically had a positive effect on yield when soil moisture was inadequate. Regression equations described the very dynamic nature of root injury, root volume, and root regrowth and their impact on yield in different growing seasons and at different locations. In addition, profit margins were estimated using a fixed insecticide cost, actual root injury data, and 4 market prices of maize. Results from different growing seasons and locations indicate that root ratings well below 4.0 can contribute to economic losses.
Document Type: Research Article
Publication date: June 1, 1998
- 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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