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GrainGenes Pathology Report: Rhizoctonia Root Rot

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Rhizoctonia Root Rot
Host Species
Triticum aestivum
Hordeum vulgare
Avena sativa
Causal Organism
Rhizoctonia solani
Heterodera avenae
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.
ReferenceKephart KD (1993) Winter wheat disease management Insect and plant disease management handbook.
ReferenceHarder DE and Haber S (1992) Oat diseases and pathologic techniques Oat Science and Technology 307-425.
Reference(1987) Compendium of wheat diseases.