Field cage studies were done to determine the separate and combined effects of manual defoliation and feeding by the green stink bug, Acrosternum hilare (Say), on soybean, Glycine max (L.) Merrill, yield and seed quality. Defoliation was done by hand to simulate the temporal feeding pattern of the green c1overworm, Plathypena scabra (F.). Only the main stem was defoliated, although growth from branches resulted in 10 to 15% additional foliage by the end of the defoliation period (growth stage R2, full bloom). By growth stage R5 (beginning seed), about 60%of the plant's foliage was on the branches. The overall level of the highest defoliation treatment was approximately 30%. Additional plots were established to test for any cage effect on selected vegetative and reproductive growth parameters of soybean and the quality of seed. Injuries from infestation by the green stink bug reduced yield and seed quality. Yield reduction, which increased with infestation levels, was due to lower seed numbers. Moreover, as the level of green stink bug increased, the percentage of seeds with damage, the number of times seeds were fed upon, and the number of seeds fed on increased, whereas seed viability and vigor decreased. Response of yield and seed quality to defoliation varied among years. Cages increased vegetative and reproductive plant growth and increased seed quality compared with noncaged plants.
Document Type: Research Article
Publication date: April 1, 1990
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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.