Authors: SMELSER, RICHARD B.; PEDIGO, LARRY P.

Source: Journal of Economic Entomology, Volume 85, Number 6, December 1992 , pp. 2399-2403(5)

Publisher: Entomological Society of America

Abstract:

Soybeans, Glycine max (L. Merrill), in field cages were infested with bean leaf beetle, Cerotoma trifurcata (Forster), adults to determine the effect oflate-season pod feeding on soybean seed yield and quality. Regression analysis revealed that a 3.06 kglha yield loss was caused by a denSity of one bean leaf beetle per square meter. Damaged seed weight, as determined from data provided in official grain-grade reports, was regressed against the number of injured pods at harvest. This analysis indicated that, for a 2,600 kglha (40 bu/ac) yield, 685 injured pods per square meter were necessary for economic seed damage to occur. The number of seeds with more than half the surface tissue darkened and the number of seeds with some darkened tissue but on less than half of the seed surface increased significantly (P < 0.05) with the number of injured pods. Economic-injury level equations were determined for late-season bean leaf beetle pod injury. Tables are provided that contain economic-injury levels based on adult and injured-pod counts for several combinations of pest-management costs and crop-market values. Analyses revealed that economic-injury levels based on seed-yield loss are exceeded before economic penalties are incurred from damaged seed in surface-injured pods. Guidelines for economic thresholds are also provided.

Document Type: Research article

Publication date: 1992-12-01

More about this publication?

• 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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