Isolates of Rhizoctonia spp. collected from diseased rice sheaths were characterized as R. solani AG-1 IA (sasakii form), R. oryzae, and a previously indescribed collection of isolates of R. solani designated AG-UNK that failed to anastomose with AG tester isolates 1 through 8 of R. solani but anastomosed strongly with each other. R. solani AG-1 IA and AG-1 IB (web blight form) were recovered from diseased foliage of soybean showing characteric signs and symptoms of aerial blight and web blight, respectively
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R. K. Jones (1989) studied this question.