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Varietal Reaction Correlation Studies in the Septoria Disease of Oats¹

Synopsis: Septoria avenae infects the leaves, stems, glumes, and kernels of the oat plant. Oat varieties or selections vary in their reaction to all 4 phases of the Septoria disease. Correlation studies have shown a positive association in varietal reaction between all phases of the disease, a positive association in varietal reaction at different locations and in different years, and a negative association between heading date and disease reaction.

² Plant Pathologist, Crops Research Division, A.R.S., U.S.D.A. The author is indebted to H. L. Shands for the use of yield nurseries in obtaining a portion of the data on natural infection, to the workers at the several Branch Experiment Stations for their cooperation, and to R. W. Ruhde for technical assistance.

Received for publication April 17, 1957.