Hot temperature causes tiny holes inside the sweet potatoes to form. Some people call such potatoes spongy, but the proper term to use is pithy. After you have cooked the sweet potatoes, you should store them in the refrigerator.Click to see full answer. Similarly, why do my potatoes have holes in them?Holes in potatoes have most likely been caused by wireworm. They may attack the sets and sprouts of potatoes but this seldom has a disastrous effect. However serious damage can occur to the tubers as holes made by the wireworm provide access for pests such as slugs, millipedes and other soil organisms.One may also ask, how do you know if sweet potatoes have gone bad? Some common traits of bad sweet potatoes are discoloration and growths through the skin. They will begin to get soft and wet (water will leak out) and then turn brown and/or black. If part of the sweet potato goes bad, the whole potato should be thrown out as the flavor is affected. Also to know, what is eating my sweet potato plants? Voles (Microtus spp.), ground squirrels (Spermophilus beecheyi), and gophers (Thomomys spp.) have a common taste for sweet potato vines. Their vine damage is generally concentrated at the plant crown right above the soil, as they eat their way up from the tubers.How do you prevent wireworms in potatoes?Encourage them by hanging houses and feeders near your garden. Crop rotation is especially important to the organic vegetable grower because it can help reduce many pest problems that lead to the use of pesticides. Potatoes make great wireworm traps. Cut a potato in half and run a stick through the middle.