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Damage to Inflorescence of Cabbage Seed Plants by the Pale Legume Bug (Heteroptera: Miridae)

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Abstract:

Lygus elisus Van Duzee feeds on the floral parts of cabbage, Brassica oleracea L., and other Cruciferae grown for seed in western Washington. When varying densities of adults (0–4) were caged on floral parts of the cabbage inflorescence raceme, insect feeding caused the most damage to differentiating terminals, lesser damage to mature buds, and little or no damage to flowers and immature siliques. Injured buds turned yellow, became necrotic and eventually withered or abscissed at the pedicel. One adult destroyed an average of 1.69 buds per 24-h feeding period when confined to a differentiating terminal, and 0.44 buds per 48-h feeding period when confined to a group of 10 mature buds. Lygus feeding had no effect on the number of seeds per silique, seed size, or percent seed germination when insects were confined to terminals, buds, or flowers. There was some indication that the number of harvested seeds per silique was reduced when insects fed on immature siliques. The data provide a foundation for establishing economic injury levels and damage thresholds for L. elisus adults on cabbage grown for seed in western Washington.

Document Type: Research Article

Publication date: October 1, 1983

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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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