Categories of resistance in plant introductions of wheat resistant to the Russian wheat aphid (Homoptera: Aphididae)

Smith, C.M.; Schotzko, D.J.; Zemetra, R.S.; Souza, E.J.

Journal of Economic Entomology 85(4): 1480-1484

1992


ISSN/ISBN: 0022-0493
DOI: 10.1093/jee/85.4.1480
Accession: 002043797

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Abstract
Wheat cultivars previously identified as resistant to the Russian wheat aphid, Diuraphis noxia (Mordvilko), in South Africa and in Idaho were evaluated in the greenhouse to determine the categories of resistance in operation. All test entries tested possessed a significant level of tolerance to D. noxia feeding, based on percentage reductions in plant height. Twenty-one days after infestation, D. noxia maintained on the three plant introductions from South Africa displayed reduced reproductive rates indicative of low-level antibiosis. However, none of the test entries reduced overall fecundity during the total (84-d) reproductive period of the experiment. None of the test entries displayed antixenosis.