Effects of Stem Girdling by the Threecornered Alfalfa Hopper on Soybean Yields

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The effects of soybean stem girdling by Spissistilus festinus (Say) were determined for individual plants. Ca. 60% of the plants that were girdled low on the main stem early in the season did not survive to harvest. Mean yields from plants with the main stem girdled were significantly lower than plants without a girdle. Mean yields per plant for each category were: main stem girdled after July 11—1.11g; survivors with main stem girdled prior to July 11—2.68g; girdled high on main stem after July 11—4.41g; no main stem girdle but more than 50% of lateral branches girdled—8.39g; and no main stem girdle with less than 50% of lateral branches girdled—11.4g.

Document Type: Research Article

Publication date: August 1, 1975

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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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