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Scab may refer to:
- Common scab (Streptomyces scabies) - A common disease of potatoes causing skin blemishes.
- Powdery scab (Spongospora subterranea) - A less common disease of potatoes causing powdery raised patches.
- Scab or gummosis (Cladosporium cucumerinum) - A condition of cucurbits, especially cucumber, which causes oozing sunken spots on the fruit.