A regular spray schedule is recommended to protect new growth. Available fungicides are only protectant and must be applied regularly to cover new growth and to maintain a cover on older leaves. A list of registered fungicides is given in Table I and Table 2 . The disease spreads from neighbouring infected crops, paddock residues and dumps of infected tubers. Tuber dumps and paddock residues should be buried to reduce new infection.
Tomatoes are also a host.
They may be infected from the potato crop and also may infect new potato plantings. Rhizoctonia scurf, Rhizoctonia solani Rhizoctonia affects shoots, stolons and tubers. Stolons are also damaged, leading to loss of tubers. This is particularly bad in ground-stored crops, where much of the tuber may be covered. Affected tubers are downgraded.