When digging potatoes, some tubers are affected by scab.
Scab is a fungus that can infect potatoes on alkaline soils. Soil can become such as a result of excessive liming of the soil, for example. It is stored in the ground and on sick tubers. If possible, it is worthwhile to find another place for landing, you should return to the old one no earlier than after 3-4 years. For planting, select only non-infected tubers.