Rhizoctonia solani AG-8 and R. oryzae are associated with Rhizoctonia root rot of cereals in the northwestern United States. These pathogens were evaluated in the greenhouse and field for effects on disease severity and growth, development, and yield of winter wheat. Experiments in the greenhouse were performed either with pasteurized soil mixture or intact cores of natural soil collected from the field. Soil temperatures were controlled at diurnal cycles of 27/16, 23/11, or 19/6 C, or experiments were performed at ambient temperatures of 28/15 C. Inocula of the Rhizoctonia species were also placed in a band below winter wheat seed in the field. R. solani caused moderate to severe disease and reduced plant growth and development in all six greenhouse and field tests [...]
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Richard W. Smiley (1993) studied this question.