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Screening Alfalfa Seedlings for Resistance to the Tarnished Plant Bug1

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Differences among alfalfa varieties in resistance to the tarnished plant bug, Lygus lineolaris (Palisot de Beau- vois) , as measured by seedling survival or damage after infestation were demonstrated in trials involving different temperature regimes. Seedling survival of varieties did not appear to be related to seedling vigor, since varieties about equal in vigor varied widely in survival after infes- tation. Several progenies from intravariety crosses of sur- viving plants displayed higher seedling survival than their parent variety after infestation with tarnished plant bugs. However, additional evaluation of selected plants is needed to determine the type and degree of resistance. Mortality of seedlings in the cotyledon stage was higher than that for the unifoliolate or trifoliolate stages. Plant damage was higher in an 80-70 than in a 70-60°F day and night temperature regime and the temperature X variety interaction was nonsignificant. The coefficient of variation was lower when plants were grown in rows radiating from the center than when they were in parallel rows.

Document Type: Research Article

Publication date: October 1, 1967

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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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