Components of Resistance in Three Bread Wheat Lines to Russian Wheat Aphid (Homoptera: Aphididae) in South Africa

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Abstract
Studies were done to determine the level of antibiosis and tolerance in three resistant wheat, Triticum aestivum L., lines, PI 262660, PI 137739, and PI 294994, to Diuraphis noxia (Mordvilko), a serious pest of wheat in South Africa. Nymphal production was lowest on PI 262660, followed by PI 137739 and PI 294994. The mean production of nymphs per adult aphid over 21 d on PI 262660, PI 137739, and PI 294994 was, respectively, 40.0, 55.1, and 66.9% of that on the susceptible cv. Betta. In the tolerance test, the plant height and dry mass of PI 262660 were significantly less affected than the other entries. PI 137739 and PI 294994 were as severely affected as the susceptible entries.

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