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InsightHorizon Digest

Why do my sweet potatoes have holes in them

Author

William Taylor

Updated on April 04, 2026

The reason we see holes in the sweet potato is usually the activity of wireworms. This type of worm is known to attack root crops and may affect sweet potatoes to the extent that they have to be discarded and cannot be sold.

Is a sweet potato bad if it has holes?

When it comes to pithy sweet potatoes, as long as the inside of the potato has only a few holes here and there, it should be perfectly safe to eat. If the holes are all over the place, throw it away to be safe. That sweet potato probably isn’t spoiled, but it will taste bad, so there’s no point in cooking it.

Can you eat potatoes with holes in them?

The holes are small enough to cut out, and the pests have long since vanished. A few of the larger holes had been occupied by homeless millipedes, while a couple of spuds had slug damage. But most will be fine to eat with a bit of careful peeling.

Why are there holes in my sweet potato?

Answer: Wireworms or tuber flea beetles may affect various root crops, especially potatoes, sweet potatoes and onions. On harvesting potatoes, sweet potatoes, and other tubers and corms (e.g., gladiolus and dahlias), show holes or tunnels. Other crops such as onions may show scars.

Can you eat potatoes with wireworm?

Potatoes will appear unaffected until the time comes to dig up your crop. … The crop can still be eaten but cutting around the damage is likely to be a very tedious process and not worth the effort. To distinguish wireworm damage from slug damage in potatoes, cut an affected tuber into quarters to expose the tunnelling.

Do worms eat sweet potatoes?

Vermicomposting. … Health worms in a vermicompost box can consume 4 to 6 pounds of sweet potato skins and other food scraps each week. In four to six months, the worms can consume all of scraps and shredded paper into “castings,” a nutrient-rich compost that you can use for plant food.

What are small black holes in sweet potatoes?

Sometimes it’s because the potato was damaged in harvesting or storage, allowing mold spores or bacteria to enter. These typically create dark or black spots, visible from the outside, which can simply be cut away before cooking.

What insect eats sweet potatoes?

Sweet Potato Soil Insects The sweet potato root can be injured by several soil insects including: the sweet potato weevil, rootworms, wireworms, white grubs, whitefringed beetles and flea beetles.

What pest makes holes in potatoes?

Wireworm in Potatoes While slugs are the obvious culprit for holey potatoes, we mustn’t jump to conclusions. Slug entry holes look very much like those made by wireworm, the larvae of the click beetle.

How do I get rid of wireworms?

How to Get Rid of Wireworm Pests. Wireworm control involves taking a soil sampling for wireworms or inspecting the soil after plowing in the fall. Dry flour baits can be inserted into the soil using a corn planter. Twenty-five baits should be put out per acre, and these traps should be checked every couple days.

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How do you keep worms from eating potatoes?

Cultural practices for potato worm control may include prevention of soil crack with regular irrigation, setting tubers deeply, at least 2 inches (5 cm.), prompt harvesting, and sanitation of the garden through removal of volunteer plants, crop rotation, clean storage practices, plantation of uninfected seed pieces, …

What does a wireworm look like?

Common in home gardens across North America, wireworms (up to 1-1/2 inch long) are tough slender worms with shiny skin and three pairs of legs just behind their head. They are yellow to brownish-red in color and feed entirely underground, attacking germinating seeds, roots, bulbs and tubers.

Are wireworms bad?

Yes roots! They can easily eat enough of the roots of a plant to cause it to become sick or die. They like to burrow into root vegetables like carrots, onions, and radish and are especially hard on potatoes. They will burrow into the potato, leaving holes behind.

Are black spots inside sweet potatoes bad?

If your sweet potatoes have small black dots, they are still safe to eat. These can mean anything from bruising and oxidization to chemical reactions from cooking. However, if your sweet potato has deep black pits, that is a sign of rot and you should discard it.

How can you tell a sweet potato is 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.

What do bad sweet potatoes look like inside?

Spoiled sweet potatoes have soft, spongy spots. They might have turned dark brown or black. Any mold is suspicious. Reject sweet potatoes that show signs of shriveling.

How do you keep worms out of sweet potatoes?

Gardeners have limited options when it comes to controlling populations of worms. The best way to manage them is to not plant sweet potatoes in infected soil. Wireworms are more likely to occur in soil that previously had clover or alfalfa crops.

How do you control weevils in sweet potatoes?

A wide range of management strategies in controlling sweet potato weevils includes; cultural method, chemical method, biological method, Sterile Insect Technique, soil management, Sterile Insect Release, pheromone traps, Host Plant Resistance and Integrated Pest Management.

Can I compost sweet potato peels?

Yes! Yes, sweet potatoes, also known (somewhat inaccurately) as yams, can be added to your compost heap. … Sweet potato skin – peelings or otherwise left over skin – will rot down quite quickly.

What keeps eating my potatoes?

Soil Insects Wireworms, flea beetles, potato tuberworm and white grubs are all soil-dwelling pests that feed on potato tubers. Wireworms are small, yellow-brown worms, while white grubs and potato tuberworms are white-ish.

Do worms live in potatoes?

Potato wireworms look at first glance like small, thin earthworms. … They burrow into the potato leaving holes which allows rot and other diseases access. Wireworms can attack other root vegetables, especially carrots, leeks and the stems of seedlings just below the soil.

What eats holes in sweet potatoes?

Sweet Potato Flea Beetle Adult beetles are black, about 1/16-inch long and usually hop away when disturbed. They are easily recognized by the tendency to eat narrow grooves in the upper surface of sweet potato leaves. Larvae make small winding tunnels just under the skin of sweet potato roots.

How do I keep bugs off my sweet potato vine?

Control both these pests with a spray solution containing 3 to 5 tablespoons – or the label’s specified amount – of plant-based pyrethrin insecticide in a gallon of water.

How do you get rid of aphids on sweet potato vines?

You can often get rid of aphids by wiping or spraying the leaves of the plant with a mild solution of water and a few drops of dish soap. Soapy water should be reapplied every 2-3 days for 2 weeks.

What does a potato worm look like?

Larvae, caterpillar-like (PTW, worm), are gray, cream or pale green with a dark brown head about half to three-quarter inch long in the final instar (pictured). Pupae are yellow or rust colored; pupation occurs among dead leaves or debris, in soil, or on stored tubers.

What causes holes in potato leaves?

Flea beetles usually don’t damage tubers, but their feeding does result in many small holes throughout leaves. These small “shot holes” can make potato plants susceptible to bacterial and fungal diseases such as Verticillium wilt and Fusarium rot.

Can wireworms bite?

Millipedes in of themselves are harmless (do not bite, sting transmit diseases), and in fact are beneficial in their natural role as decomposers (feeding on dead organic matter). It is the sudden presence of large populations moving in and about residential properties that can be disconcerting.