Influence of Variety on Abundance and Within-Plant Distribution of Onion Thrips (Thysanoptera: Thripidae) on Cabbage

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Numbers of onion thrips, Thrips tabaci Lindeman, were significantly lower in August and early September in the heads of two resistant cabbage varieties ('Titanic 90' and 'Falcon') than in two susceptible varieties ('Market Prize' and 'Supergreen'). Numbers of onion thrips on the frame or outer leaves were significantly higher on resistant than susceptible varieties in September. These differences remained when thrips numbers were adjusted using the head and frame dry weight as covariates to remove any effect of differences in head or frame size among varieties. After adjustment, the populations on susceptible heads ranged from 2.8 to 11.5 times as high as populations on resistant heads from 17 August to 14 September in 1983 and 1984. The resistant varieties 'Falcon' and 'Titanic 90' had as many thrips per plant as suceptible varieties, but fewer thrips infested the head of resistant varieties and caused less cosmetic damage to the marketable product.

Document Type: Research Article

Publication date: August 1, 1988

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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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