Interaction Between Biotypes of the Spotted Alfalfa Aphid and Resistance in Alfalfa

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The interaction between virulence in Therioaphis maculata (Buckton) and resistance in 'Hayden' and 'Lahontan' alfalfas was investigated. Evidence of a gene for gene relationship was found between biotypes (C, A, E, F, H) of the spotted alfalfa aphid expressing genes for virulence and in plants selected from Hayden expressing corresponding genes for resistance. This relationship was not evident between these same biotypes and plants selected from Lahontan alfalfa. The relationship in Hayden appears to be oligogenic (specific) since resistance to avirulent biotypes was not conferred in plants to virulent biotypes. The genic system in Lahontan was unusual and may be polygenic or oligogenic (general) since all plants selected for resistance to avirulent biotypes were equally resistant to virulent biotypes and vice versa. Lahontan alfalfa should be fully exploited so that these traits can be incorporated into alfalfa cultivars where polygenic resistance to the spotted alfalfa aphid is desired.

Document Type: Research Article

Publication date: June 1, 1974

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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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