in taxon disease causes dysfunction of disease has infectious agent Triticum aestivum Rhizoctonia solani root system plant disease wheat fungal disease wheat Rhizoctonia root rot fungal disease plant_stress_ontology PSO:cooperl A wheat disease caused by a Rhizoctonia solani affecting a root system. 0000-0002-9013-5974 APSNET:Wheat Symptoms and signs: Distinct patches of stunted plants are indicative of Rhizoctonia root rot. Occasionally, seedlings are killed outright, resulting in bare patch. Under low magnification, root ends appear reddish brown and taper to a fine point, a diagnostic symptom known as spear tip. Usually only half of a lesion is evident at the end of a root.