Thrips¹ That Affect Production of Grass Seed in Oregon²

Author: KAMM, J. A.

Source: Journal of Economic Entomology, Volume 65, Number 4, August 1972 , pp. 1050-1055(6)

Publisher: Entomological Society of America

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Abstract:

The thrips Anaphothrips obscurus(Muller), Aptinothrips rufus(Gmelin), A. stylifer Trybom, and Rhipidothrips brunneus Williams, either alone or in mixed populations can inflict economic injury to grasses grown for seed. A. obscurus is a highly mobile and destructive thrips in Oregon grasslands and has a high reproductive potential when conditions are favorable. The cultural practice of burning fields to kill plant pathogens also reduces the number of over wintering thrips but surviving thrips may produce economic injury the following year. The relatively small number of over wintering' thrips in certain grasses in early spring produce a type of silver top by feeding on the inflorescence within the leaf sheath and, thereby, reduce the yield of bell grass. After the heads emerge from the leaf sheathes, thrips move to the protected environment of the lower leaves and do little damage to the heads. The number of th1'ips that developed under favorable conditions after heads have emerged from the leaf sheath can destroy 1/2-2/3 of the leaves, which undoubtedly reduces the quality and yield of seed.

Document Type: Research article

Publication date: 1972-08-01

More about this publication?

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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