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Inheritance of Reaction to Septoria avenae in Oats¹

Synopsis: In nine populations involving F₂, F₃, and F₄ generations from several susceptible x resistant crosses variation in segregating populations was continuous with distributions approaching normality. Heritability estimates, calculated by several methods, were high. The data indicate that Septoria reaction should be treated as a quantitative character in oat breeding.

² Formerly Plant Pathologist, Crops Research Division, ARS, USDA. Present address: Department of Plant Pathology, University of Illinois, Urbana, Illinois. The author is indebted to H. L. Shands for F₃ seed of the crosses X486-7 x Clintafe and Fayette x Ajax; to J. H. Torrie for advice on statistical procedure; and to R. W. Ruhde for technical assistance.

Received for publication June 19, 1959.