Rhizoctonia Disease on Potato

The Rhizoctonia disease complex of potatoes comprises two distinct phases: infection of growing plants (Rhizoctonia canker) and infestation of daughter tubers by sclerotia (black scurf). Either or both phases may be present in potato crops. Both are economically important and each has been the object of much research. However, caution must be used when interpreting data reported in the literature because not all authors define which phase they are dealing with when talking about the “Rhizoctonia disease”.