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During the last 3 years, potatoes (Solanum tuberosum L.) with symptoms typical of Rhizoctonia canker and black scurf have been found in Catalonia; from 21,546 samples submitted to the official diagnostic laboratory (Laboratori de Sanitat Vegetal, DARP, Generalitat de Catalunya), 20% were infected with R. solani. Also, basidia and basidiospores of Thanatephorus cucumeris (A.B. Frank) Donk, the teleomorph of R. solani, have been observed frequently on stems near the soil surface. Previous work (1) has reported R. solani in the same geographic area, but anastomosis groups (AG) were not identified. Isolates (103) were collected from damaged roots, mature or progeny tubers, soil, debris, and weeds (roots and stem of Oxalis latifolia, Diplotaxis eurocoides, Solanum nigrum, Sorghum halepense, and Chenopodium album) in fields where potatoes were cultivated. All isolates were multinucleate, variable in …