Effects of Hand Defoliation on Yield and Seed Weight of Soybeans1

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Defoliation of soybeans by phytophagous insects was simulated with band defoliation at various percentages and stages of growth of soybean plants. Significant differences in yield and seed weight were obtained following single defoliations of 33. 67. and 100% at several stages of growth. Continuous and progressive defoliations at all percentages drastically reduced yields and seed weight at all stages of growth tested.

Comparison of data obtained in 1969 and 1970 indicated that early season single defoliation (up to full bloom) of 1/3 or 2/3% was more detrimental to yield at higher yield levels than at lower yield levels.

Document Type: Research Article

Publication date: April 1, 1972

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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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