Abstract
A study of the varietal reactions of oat varieties to powdery mildew ( Erysiphe graminis DC.) has revealed that there is no lack of mildew-resistant breeding material in the genus Avena . Most of the varieties tested were highly susceptible to attack; others, though not immune, showed a high degree of resistance at certain phases of plant growth. The two diploid varieties A. strigosa ssp. hirtula and A. strigosa var. glabrota , and the hexaploid Cc 4146 exhibited a high degree of resistance in the seedling and adult stages. Preliminary studies on the inheritance of reaction to Erysiphe graminis avenae have shown that, in two crosses studied, resistance and susceptibility appeared to be dependent on a single factor pair. With the identification of these new factors for resistance to mildew a really effective approach towards the control can be made by breeding. As considerable variations in the stability of reaction to infection were observed in the different hosts, some showing more or less uniformity of resistance and others showing considerable fluctuation, it appears that resistance to Erysiphe graminis avenae could, with advantage, be studied also in relation to the possible existence of physiologic races.
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