| Abstract
| - Summary. The progenies of the crosses Landhafer × Punjab local, ag 331 × Punjab local and Gopher × Curt were studied in relation to their resistance against the most virulent race 227 of crown rust and their yield performance. Landhafer was found to possess one dominant gene for resistance to this race, while the oat cultivar ag 331 had two, Gopher had only one gene for resistance, the expression of which was suppressed by an inherent inhibitory factor. The few selected fixed lines of these crosses were put into multilocational yield trials. All the lines (cultures) of cross ag 331 × Punjab local were resistant to rust. They were superior to Kent by 4-46% in fodder and 2-35% in grain yield. The cultures of the cross Gopher × Curt were superior by 23-49% in fodder and by 9-35% in grain yield to Kent besides being resistant to rust.
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