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After I dug my sweet potatoes, I found as much as half of each sweet potato covered with a black, necrotic scab that decays rapidly.

Last Updated: January 07, 2008

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This is sweet potato scurff and is caused by a soil-borne fungus. It is controlled by growing sweet potatoes in acid soil. Also, the use of disease-free slips and rotating crops helps prevent the disease.

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