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Serological Relationships Among Anastomosis Groups of Rhizoctonia solani. Gerard C. Adams, Jr., Graduate student, Department of Plant Pathology University of California, Davis, CA 95616; Edward E. Butler, professor, Department of Plant Pathology University of California, Davis, CA 95616. Phytopathology 69:629-633. Accepted for publication 19 December 1978. Copyright 1979 The American Phytopathological Society. DOI: 10.1094/Phyto-69-629.

Sixty-four isolates of Rhizoctonia solani were compared serologically with the use of antisera developed against one tester strain for each of six anastomosis groups (AG). Gel-diffusion tests showed that all anastomosis groups had several antigens in common; AG-2, AG-3, and AG-5 each had at least one specific antigen. Anastomosis groups 1 and 4 were difficult but possible to separate serologically. The serologic groups corresponded to the anastomosis groups, with the exception of AG-2 type 1 and AG-2 type 2, which were serologically indistinguishable. A rapid, simple method for determining the serologic grouping of field isolates is described. The common antigens were stable when heated 20 min at 121 C.