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Characterization of Isolates of Rhizoctonia solani from Cereal Roots in South Australia and New South Wales. A. D. Rovira, CSIRO Division of Soils, Glen Osmond, South Australia 5064; A. Ogoshi(2), and H. J. McDonald(3). (2)Faculty of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-Ku, Sapporo 060, Japan; (3)CSIRO Division of Soils, Glen Osmond, South Australia 5064. Phytopathology 76:1245-1248. Accepted for publication 22 January 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/Phyto-76-1245.

Highly pathogenic isolates of Rhizoctonia solani from roots of wheat and barley from widely separated areas of South Australia and one site in New South Wales have been shown to belong to a single anastomosis group. These isolates readily anastomosed with AG-BI and rarely with AG-2-1 and AG-2-2 IIIB, yet differed from these anastomosis groups in cultural characteristics and are thiamine autotrophic. These results support an earlier proposal that a new anastomosis group. AG-8, be formed to accommodate these isolates of R. solani, which cause severe losses to cereal crops in southern Australia.

Additional keywords: Thanatephorus cucumeris.