in taxon disease causes dysfunction of disease has infectious agent Pyricularia oryzae Triticum aestivum plant structure plant disease wheat fungal disease wheat blast disease fungal disease PSO:cooperl 0000-0002-9013-5974 plant_stress_ontology A wheat disease caused by a Pyricularia oryzae affecting a plant structure. APSNET:Wheat Symptoms and signs: The pathogen produces lessions on all aboveground parts of plant, but spike infection results in greatest damage. Lessions are round to elliptical with gray centers and reddish brown margins. Severely infected seedlings may die.