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Plant Bug (Hemiptera: Miridae) Damage to Birdsfoot Trefoil Seed Production

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Two insecticide timing field experiments were conducted each year from 1988 to 1990 to study control of three plant bugs, Adelphocoris lineolatus (Coeze), Lygus lineolaris (Palisot de Beauvois), and Plagiognathus chrysanthemi (Wolll), in birds foot trefoil, Lotus corniculatus L., seed production. A new technique was developed to Cornbine plant bug sweep counts. Counts were weighted based on the damage potential of the species and stage. The weighted counts were then Cornbined into plant bug equivalents (PBE). When PBE reached 153 per 20 sweeps and bugs were not controlled, seed yield was significantly reduced and shriveled seed increased from 3 to 20%. However, plant bug populations up to 127 PBE per 20 sweeps did not significantly reduce seed yield. Crop maturity, rated on a scale of 1-5, showed that plant bugs significantly delayed crop development. A single application of malathion at the bud stage adequately controlled plant bugs. Multiple applications of insecticide did not provide any seed yield benefit Compared with a single bud stage spray.

Document Type: Research Article

Publication date: February 1, 1992

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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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