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Etiology

Pathogenicity of Ceratobasidium cornigerum and Related Fungi Representing Five Anastomosis Groups. L. L. Burpee, Former research assistant, Department of Plant Pathology, The Pennsylvania State University, University Park, 16802, Present address of senior author: Bermuda Department of Agriculture and Fisheries, Hamilton, BDA; P. L. Sanders(2), H. Cole, Jr.,(3), and R. T. Sherwood(4). (2)(3)Research associate, and professor, Department of Plant Pathology, The Pennsylvania State University, University Park, 16802; (4)Research plant pathologist, SEA-USDA, U.S. Regional Pasture Research Laboratory, University Park, PA 16802. Phytopathology 70:843-846. Accepted for publication 24 January 1980. Copyright The American Phytopathological Society. DOI: 10.1094/Phyto-70-843.

Pathogenicity of 40 isolates of Ceratobasidium cornigerum and related binucleate Rhizoctonia solani-like fungi representing five Ceratobasidium anastomosis groups (CAG 1–5) was evaluated on eight plant species representing six families. Isolates in CAG 1 were pathogenic on gramineous hosts but nonpathogenic or only weakly virulent on species in other families. Isolates in CAG 2 were weakly virulent on pea and French bean seedlings and nonpathogenic on other species. Isolates from CAG 3, 4, and 5 exhibited a wide host range, were more virulent, and caused seed, root, and/or hypocotyl decay. Isolate × soil temperature interactions for disease development were observed in inoculations of wheat and pea seedlings.