Varieties of common oats (Avena sativa) show very little resistance to the Septoria disease in field and greenhouse test. Several selected varieties and strains showed moderate tolerance under field contitions but gave a susceptible reaction when heavily inoculated in the greenhouse. a number of varieties from wild species, especially those in the diploid group, showed a much higher level of resistance. The differences in reaction between these and varieties of common oats was particularly noticeable when the varieties were compared in the greenhouse several weeks after inoculation. Macrospore inoculations in the greenhouse resulted in too severe an affection to permit the detection of small differences in reaction. The use of ascospores as inoculum indicated that this might be a better means of screening varieties in the greenhouse for resistance.

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