When a tree comes down, the stump often stays behind. Grinding it out costs money, and an old stump doesn't seem to hurt anything. For many homeowners in Fairfield, it becomes a spot for a planter or simply part of the yard. Over time, though, a stump rots, and rotting wood is exactly what wood-destroying insects are looking for. Below, we'll cover which pests live in tree stumps, when a stump puts your house at risk and what you can do about it. If you're worried that something has already moved from the yard to the house, a professional termite inspection is the best place to start.
Why Stumps Attract Pests
A living tree defends itself with bark and sap. Once it's cut, that defense is gone. The stump and its root system slowly break down over several years, softened by moisture and fungi. Soft, damp, decaying wood is easy for insects to chew and tunnel through, and the roots stretch out underground, sometimes toward your foundation. A stump is basically a large, slow-rotting food source sitting in your lawn. How long that takes depends on the type of tree, the size of the stump and how wet the soil stays. Hardwood stumps in shady, damp spots can stay soft and attractive to insects for a long time, while the roots keep decaying out of sight below the lawn.
Pests That Commonly Live In Stumps
- Subterranean termites. These termites live in the soil and feed on wood that touches the ground. A decaying stump and its roots are a natural food source, and a colony feeding there can forage outward.
- Carpenter ants. Carpenter ants don't eat wood, but they hollow out soft, moist wood to build nests. Rotting stumps are a classic outdoor nesting site.
- Wood-boring beetles. Several native beetles lay eggs in dead and dying wood. Most are part of normal decay and don't move into homes.
- Yellow jackets. They sometimes nest in hollow, rotted stumps or in cavities around the roots, which can surprise anyone mowing nearby.
- Moisture pests. Millipedes, sowbugs, earwigs and slugs shelter in the damp wood and loose bark.
Mushrooms around a stump are a sign of decay, not of insects, but they tell you the wood is breaking down and becoming more attractive to pests.
When A Stump Becomes A Risk To Your House
A stump in the middle of a large yard is a lower concern than one near the house. The risk goes up when:
- The stump is close to the foundation, a deck, a porch or a fence that connects to the house.
- Roots run under or alongside the foundation.
- There's other wood touching the soil nearby, like landscape timbers, firewood or old fence posts.
- You've already seen termite swarmers or carpenter ants inside.
Termites or carpenter ants living in a stump don't mean your home is infested. They do mean there's an active colony nearby, and it's worth keeping a closer eye on the house. Our guide to carpenter ant damage vs termite damage explains how to tell the two apart.
Signs To Look For
- Swarmers. Winged termites or winged ants coming out of the stump or the ground near it, usually in spring.
- Mud tubes. Pencil-width tunnels of soil on the stump, the foundation or nearby wood.
- Coarse sawdust. Piles of wood shavings mixed with insect parts at the base of the stump point to carpenter ants.
- Foraging trails. Large black ants traveling between the stump and the house, often at night.
What To Do About An Old Stump
- Consider grinding or removal. Grinding the stump below grade removes most of the wood above ground. Larger roots may remain and continue to decay.
- Handle the chips. Don't spread fresh stump grindings against the foundation. Use them away from the house or haul them off.
- Remove other wood. Clear landscape timbers, old posts and firewood that touch the soil near the house.
- Don't disturb a nest. If wasps are flying in and out of a stump, keep people and pets away and leave it alone.
- Watch the house. Check the foundation, sill plates and nearby decks for mud tubes or soft wood.
When To Call A Professional
If you see signs of termites or carpenter ants at a stump near your house, it's smart to have the home inspected. Our NJ DEP-licensed technicians can identify the insects, check the foundation and wood structures for activity and recommend a plan using EPA-registered, eco-safe products. Stump grinding and tree work are jobs for a tree service, but we can tell you whether the pests in the stump are a threat to your home.
An old stump doesn't have to be a problem. Knowing what lives in it and keeping an eye on the nearby structures will help protect your Fairfield home from the pests that rotting wood attracts.