As for any developing sprouts, those can be cut off too. Purchase disease free roots and slips. Sometimes, the entire root rots. Dark, dry, bruise-like lesions on sweet potato may be a symptom of a common disease of Ipomoea. The second type of bruising shows up just under the skin or deeper inside the potato as a black spot. The disease is easily transmitted from equipment, insects, contaminated soil or plant material. The black spots you'll see inside the potato are actually bruises, caused by the potatoes getting bumped and jostled as they made their way from the soil to a warehouse to a retailer and eventually to your home. 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Seasoned Advice is a question and answer site for professional and amateur chefs. 8 Easy Ways to Make Boxed Mac … Black spots are usually bruises caused by rough handling. To learn more, see our tips on writing great answers. Sweet potatoes should be planted in full sun and require plenty of space as the vines will spread over large areas. There were a bit dark around the corner. Sweet potatoes with black rot will develop larger spots that darken and have tiny black fungal structures with stalks. Slips or roots can be treated with a pre-planting dip of fungicide. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How is this octave jump achieved on electric guitar? The … Additionally, it overwinters in sweet potato plant debris or certain host plants, such as wild morning glories. There are a couple of reasons for this, according to Brandon Parker, an agriculture agent with North Carolina State University's cooperative extension program. Although it may sound daunting, that basically just means bruising that happens when a bunch of potatoes lay against each other for a long time. But, once you spot some scurf, try to use up the sweet potatoes quickly. The disease can also affect such plants as cacao, taro, cassava, coffee, and mango. I don't know what kind. Odd spots inside sweet potato? These cause a sweet, sickly fruit smell and may invite insects to transmit the disease. Sweet potatoes with black rot are essentially animal fodder or garbage once infected. It was not soft or pithy and did not smell bad. It sounds like your sweet potatoes may have been infested with mold (thus the dark color), in which case the wisest course of action would be to have discarded them. Without pictures (or perhaps lab results), it is very difficult to say. They don't taste any different than the rest of the potato. 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