2 Mains, E. B., and Dietz, S. M., "Physiologic Forms of Barley Mildew, Erysiphe graminis.Hordei Marchal," Phytopath., 20, 229-239 (1930).3 Mains, E. B., and Martini, Mary L., "Susceptibility of Barley to Leaf Rust (Puccinia anomala) and to Powdery Mildew (Erysiphe graminis Hordei)," U. S. Dept.Agr.Tech.Bull., 295, 33 (1932).' Marchal, E., "De la sp&cialisation du parasitisme chez l'Erysiphe graminis," Compt.Rend.
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Carl D. LaRue (1933) studied this question.