in taxon disease causes dysfunction of disease has infectious agent Blumeria graminis Triticum aestivum vascular leaf plant disease wheat fungal disease wheat powdery mildew fungal disease Symptoms and signs: effuse patches (colonies) of cottony mycelium and conidia on the surface of plant, initially white and sporulating and late turning gray brown. As the powdery mildew colonies mature, the fungus produses cleiostothesia as distinct as brown black dots. PSO:cooperl 0000-0002-9013-5974 A wheat disease caused by a Blumeria graminis affecting a vascular leaf. plant_stress_ontology APSNET:Wheat