Take all precautions to minimize cuts and bruises when harvesting and handling tubers. Never wash tubers prior to storage. Occurs on cabbages when it is too humid. Black spots rolling of upper leaves and the stems rot away. Dry out the area and the air.
Black leg appears as the blackening of the stems at the base of the affected plant.
This problem is caused by fungi and bacteria. It is a problem amongst potatoes, brussels sprouts, cabbage, and cauliflower. The cabbage family of plants will also have leaves which turn purplish in color, in addition to the base of the stems turning black. Potato plants will have small leaves at the top of the plant which curl inward. Remove infected plants promptly.