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Potato tubers infected with Phytophthora cause cellar rot
Symptoms: Slightly sunken dark or purple lesions appear in patches on the surface of the tubers, extending less than 1cm into the tuber. White mold is generally not easy to see, but when humidity in the cellar is high, white mold grows on the diseased area, which is the pathogen's sporangiophores and sporangia. This causes cellar rot. For the pathogen, transmission routes and disease conditions, see Potato Diseases - Potato Late Blight. For control methods, see Potato Dry Rot.