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GrainGenes Pathology Report: Rhizoctonia Root Rot

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Pathology	Rhizoctonia Root Rot
Type	Fungus
Host Species	Triticum aestivum Hordeum vulgare Avena sativa
Causal Organism	Rhizoctonia solani Heterodera avenae
Symptoms	Seedling infections often create distinct patches of dead (bare patch) or stunted plants expressing a dull blue-gray color (purple patch). Surviving plants remain stunted and often lodge or produce white heads, similar to numerous crown rot diseases. Roots are girdled and often severed in the upper six inches of the soil profile. Severed root tips appear reddish-brown and taper to a spear-shaped point. Rhizoctonia root rot is favored by reduce and no-till tillage practices.
Reference	Kephart KD (1993) Winter wheat disease management Insect and plant disease management handbook. Harder DE and Haber S (1992) Oat diseases and pathologic techniques Oat Science and Technology 307-425. (1987) Compendium of wheat diseases.

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