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Reliability of Yield Models of Defoliated Soybean Based on Leaf Area Index Versus Leaf Area Removed

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Several different measures of defoliation have been used in pest management to predict yield losses and potential yield, including leaf area removed, percentage of defoliation, and remaining leaf area. Plots were defoliated at 4 rates from R2 to R5, with the effects of drought stress also tested. Differences in precision of yield and yield-loss estimates based on remaining leaf area and leaf area removed were examined. Leaf area removed did not predict yield as well as did remaining leaf area, especially when data were pooled over irrigation rate. However, data expressed as remaining leaf area have limited pest management applications unless these data can be coupled with additional information, such as initial canopy size, pest population density, or predictions of future injury.

Document Type: Research Article

Publication date: June 1, 1996

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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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