Journal of Economic Entomology (1998) 91, 723-740

Michael E. Gray and Kevin L. Steffey (1998)
Corn rootworm (Coleoptera: Chrysomelidae) larval injury and root compensation of 12 maize hybrids: an assessment of the economic injury index
Journal of Economic Entomology 91 (3), 723-740
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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Michael E. Gray

Research topic(s) for pests/diseases/weeds:
damage/losses/economics
thresholds/decision-support systems

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diabrotica virgifera	Maize/corn (Zea mays)	U.S.A. (mid N)