Abstract
Experiments were carried out to determine the relative levels of antibiosis, tolerance, and antixenosisin four barley ( Hordeum vulgare L.) genotypes, S12. (ASE/2CM//B.7.6.B.B.), S13 (Gloria/Come), S16 (‘Esperanza’) and S17 (‘Shyri’) to the Russian wheat aphid, Diuraphis noxia (Mordvilko). Oats (Avena sativa L. var. ‘Paramo’) were used as a resistant check. From field screenings, S12 and S13 were selected as resistant to D. noxia and S16 and S17 susceptible. S12 and S13, in comparison with S16 and S17, showed high levels of antibiosis, demonstrated by low rates of nymph production on whole plants and on excised leaves. S13 showed higher tolerance than the other genotypes; mature plant height was reduced slightly by D. noxia 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 S16 and S17. S13 is 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.
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