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Synopsis Yellow dwarf resistance was controlled by 1 gene in each of 4 barley varieties. Evidence from resistant ✕ resistant crosses indicated that these varieties carried the same gene for resistance. This gene conditioned a level of resistance adequate to assure fair yields under the most severe yellow dwarf conditions. No associations were found between the gene for resistance to yellow dwarf and genes located on linkage groups I and II.

Synopsis Eight varieties, 6 resistant to net blotch and 2 susceptible, were used as parents in the genetic studies reported in this paper. Three genes for resistance—Pt1, Pt2, and Pt3—differentiated the six resistant varieties from the susceptible varieties, Atlas and Atlas 46. Pt1 and Pt2 were tightly linked with about 2.57% recombination; Pt3 was inberited independently of the linked genes. The genes for net b'otch resistance were inherited independently of the Hanna gene for mildew resistance carried by Atlas 46.

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