When it comes to dealing with wasp nests, many people focus their attention on the upper areas of a home, such as porches, eaves, and overhangs. However, it’s equally important to check the ground for in-ground nests. Some types of wasps and bees prefer to burrow or make nests in existing holes in the soil. If you come across an underground wasp nest, it’s essential to assess whether it poses a threat and how best to handle it.
The first step in addressing an in-ground wasp nest is to identify the type of insects that are using it. While some wasps can be dangerous, others are actually beneficial. Three common groups of wasps that live underground include cicada killers, yellowjackets, and sand wasps. Cicada killers are generally harmless to humans, while yellowjackets can become aggressive if they feel threatened. Sand wasps are rarely found in yards or gardens. Additionally, the nest might belong to bees. If the nest is home to a species that helps your lawn and garden, it’s best to leave them undisturbed. However, marking the area can help you and others avoid it in the future.
If the wasps pose a potential threat, such as bald-faced hornets or other yellowjackets, you may need to take action to remove them. One option is to wait them out. By late fall, the queens will have mated and will leave the nest to find a place to hibernate. Once they’re gone, the rest of the colony will die off. If you discover the nest later in the year, this might be the most effective approach.
If the situation requires immediate action, there are several options available. Regardless of the method you choose, it’s best to act during the evening, night, or early morning. This is because wasps are less active and more likely to be inside the nest during these times, making it easier and safer to deal with them. Cooler temperatures at night also reduce their aggression, giving you a better chance of avoiding stings.
Once the wasps have returned to the nest, you can apply an insecticide. One effective method is using a spray foam wasp killer. These products can be applied from a distance, as the spray can reach up to 30 feet. However, you’ll need to be close enough to target the nest accurately. A flashlight can help improve visibility in low light conditions. After filling the hole with foam, move away immediately.
Another approach involves getting closer to the nest. Using powder insecticides like Sevin insect dust killer is a popular choice. Fill a disposable cup with the powder, quietly approach the nest, and quickly pour the dust into the hole. Then, retreat quickly. This method should work within a day or two as the wasps track the powder into the nest. You can also pour soapy water into the nest to prevent the wasps from flying. A 5-gallon bucket works well for this. Placing a piece of mesh screen over the hole before pouring the water can help prevent the wasps from following you.
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