Thanatephorus cucumeris

Cereals in regions of England, South Australia, Canada, and India experience losses caused by "R, solani" every year. Roots are killed back, causing plants to be stunted and spindly. Other noncereal plants in those regions can experience brown stumps as another symptom of the pathogen. In England, this is called purple patch. "R. solani" can also cause hypocotyl and stem cankers on mature plants of tomatoes, potatoes, and cabbages. Strands of mycelium and sometimes sclerotia appear on their surfaces. Roots turn brown and die after a period of time. The best known symptom of "R. solani" is black scurf on potato tubers, which are the sclerotia of the fungus.