Experiments were carried out to determine the relative levels of antibiosis, tolerance, and antixenosisin four barley (Hordeum vulgare L.) genotypes, 812. (A5E/2.CM// 220.127.116.11.8.), 813 (Gloria/Come), 516 ('Esperanza') and S17 ('Shyri') to the Russian wheat aphid, Dturaphis noxia (Mordvilko). Oats (Avena sativa L. var. 'Paramo') were used as a resistant check. From field screenings, 512 and 513 were selected as resistant to D. noxia and S16 and S17 susceptible. S12 and 513, in comparison with S16 and 517, showed high levels of antibiosis, demonstrated by low rates of nymph production on whole plants and on excised leaves. 513 showed higher tolerance than the other genotypes; mature plant height was reduced slightly by D. nona feeding, and dry mass foliage loss per unit of aphid mass produced was relatively low. No antixenosis was demonstrated for the barley genotypes. Overall, S12 and S13 were more resistant to D. noxia in terms of antibiosis and tolerance than 516 and 517. S13is a widely tested, high-yielding barley genotype with multiple disease resistance and represents for breeders a useful source of resistance to D. noxia in a superior genetic background.
Document Type: Research Article
Publication date: April 1, 1991
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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.