This project undertook a comprehensive survey of Certified Seed potato growers throughout the State of Victoria and of ware and processing growers in South Australia to determine the incidence and severity of black dot, caused by the fungus Colletotrichum coccodes and other diseases of potato tubers. Samples of tubers taken at random from consignments of potatoes of different cultivars were washed and the incidence and severity of tuber skin diseases recorded.