Disease
ScabRough, corky patches on potato skins

Rough, corky patches on potato skins. It’s only skin deep.
When it shows up: At harvest, after dry summers
What to do
Peel them: they’re fine to eat.
Water in dry spells while the potatoes are forming.
Don’t lime the ground before planting potatoes.
Not quite it?
These look similar. Compare the photos.

