Introduction
Rhizoctonia diseases of potato are caused by the fungus Rhizoctonia solani Kühn can be found on all underground parts of the plant at different times during the growing season.
R. solani causes black scurf on tubers, stem and stolen canker on underground stems and stolen and occurs wherever potatoes are grown.
The symptoms of the disease are found on both above and below ground portions of the plant.
Black scurf is the most conspicuous sign of Rhizoctonia disease .