It has a wide host range and distribution and causes sheath blight in some field crops, such as corn ( Ogoshi 1987), rice ( Ou 1985), lawn grass ( Parmeter et al. 1969) and cucumber ( Strashnov et al. 1985). Currently, Rhizoctonia disease is managed by cultural practices, such as crop rotation with grains, and methods that minimize prolonged contact of the plant with the pathogen, such as planting in warmer, drier conditions to promote rapid sprout emergence and promptly removing tubers from the field ( Secor and Gudmestad 1999). Chemical fungicides are often used when losses from R. solani are substantial ( Parry 1990). However, current cultural and chemical controls are not completely effective, and Rhizoctonia disease remains a persistent problem.