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Typical discolorations on tubers  can be:

• Silvery lesions with well defined brown margins, when microsclerotia are present, these are thin and not well spaced > Silver scurf, 
• Diffuse brown lesions irregulary shaped with less well-defined margins, when microsclorotia are present, these are larger than those of silver scurf and regularly spaced > Black dot,   
• Orange brown lesions, irregular in shape with distinct but irregular margin, absence of microsclerotia on the lesions > Golding blotch 
• Other discolorations can be encountered, which are not readily attributable to a specific cause

Click on a picture to learn more about each discoloration

Silver scurf	Black dot
Golding blotch	Other skin discolorations