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Host Ranges and Interrelations of Erysiphe graminis hordei, E. graminis tritici, and E. graminis avenae. Nava Eshed, Faculty of Agriculture, the Hebrew University of Jerusalem, Rehovot, Israel; I. Wahl, Faculty of Agriculture, the Hebrew University of Jerusalem, Rehovot, Israel, Junior author’s present address: Department of Botany, Tel-Aviv University, Tel-Aviv, Israel. Phytopathology 60:628-634. Accepted for publication 28 October 1969. DOI: 10.1094/Phyto-60-628.

Each of the three varieties, Erysiphe graminis hordei, E. graminis tritici, and E. graminis avenae possess a wider host range in Israel than elsewhere. The first variety attacked accessions of 37 species representing 18 genera of the tribes Hordeae, Aveneae, Festuceae, and Stipeae. Isolates of E. graminis tritici attacked entries of 47 species belonging to 16 genera of the above four tribes. Accessions of 31 species of 20 genera representing the same tribes were compatible with E. graminis avenae. Hosts receptive to cultures of two varieties of E. graminis were found. They were congenial with either E. graminis hordei and E. graminis tritici, E. graminis hordei and E. graminis avenae, or E. graminis tritici and E. graminis avenae. Possibly, hosts harboring different varieties of E. graminis will facilitate their intercrossing. Phylogenetic aspects of the results obtained are discussed.