Characterization and Pathogenicity of Rhizoctonia spp. Isolated from Rice, Soybean, and Other Crops Grown in Rotation with Rice in Texas

Abstract

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