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Parasitic Specialization of Puccinia hordei in Israel. Y. Anikster, Senior lecturer, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv, Israel 69978; Phytopathology 74:1061-1064. Accepted for publication 23 November 1983. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-1061.

Alternate host Ornithogalum spp. are important in the perennation of Puccinia hordei in Israel. The racial identity of 615 isolates from Hordeum spontaneum and 447 isolates from plants of Ornithogalum spp. was determined. The isolates were collected from plants growing in the wild in six regions during 3- 4 yr in succession. The results suggest that isolates from the alternate host were parasitically more diverse than those from the main host. Populations from both sources had 17 virulence patterns in common; five patterns were present only on the alternate host and one was limited to the main host. Some virulence patterns were particularly common each year in all regions. A number of isolates from the main and alternate host rendered ineffective all known genes for specific resistance including Pa7 (in cultivar Cebada Capa), Pa3 (in cultivar Estate), and Pa9 (in USDA CI 1243).