Answer: Based on your description, it may be that the plants were attacked by root-knot nematodes. Here is a photograph: http://ext.msstate.edu/pubs/images/p1678-10.htm If the damage looked like that, you should seek out varieties resistant to root-knot nematodes such as Hernandez, Jewel or Travis. The most popular variety Centennial, unfortunately, is highly susceptible to it. You should also grow your sweet potatoes on at least a three year rotation. If the damage looked different, it may be that they were accidently damaged during harvest. Sweet potatoes are notoriously fragile and are easily damaged during digging or handling for storage.
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