Powdery Scab - Agricultural Research Service
Powdery Scab. Potato Progress. July/August 2007, pp 6-7. Interpretive Summary: Many diseases of potato reside in the soil and invade the plant through the roots. One of these is powdery scab. It gets its name because is causes blemishes on the tuber that look like scabs. If rub the scab a powder is released, thus the name.