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Old July 14, 2020   #20
brownrexx
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Join Date: Feb 2016
Location: Southeastern PA
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Potato scab is caused by a bacterium, Streptomyces scabies, and it causes either sunken or raised brown, corky spots. It is not real bad on my potatoes in the picture but can be really ugly if the spots are big or thick.

It is not harmful if you eat it but it is unattractive and makes potatoes for sale less marketable.

The bacterium lives in the soil and a low pH is supposed to help but I gave up on that and now I grow mine in straw to keep them out of the soil. Crop rotation also helps.
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