The primary damage caused by carpenter beetles occurs during the larval stage. The larvae burrow into wood to feed on it, creating tunnels and galleries that can weaken beams, joists, and other wooden structures in your home. Over time, this can result in significant structural damage, especially if the infestation is left unchecked.
The adult beetles, which are about 1-1.5 inches long, will leave behind round exit holes, about the size of a pencil lead, once they have emerged from the wood. These holes can sometimes be the first sign of a problem, but the real damage is typically hidden inside the wood itself. Left untreated, the infestation can compromise the integrity of wooden structures, particularly in older homes.
How to Spot a Carpenter Beetle Infestation
The most obvious sign of a carpenter beetle infestation is the presence of small, round exit holes in wood surfaces, such as beams, furniture, or flooring. You might also notice fine, powdery wood dust, called frass, around these holes. This frass is actually the debris created by the larvae as they tunnel through the wood.
If you suspect a carpenter beetle infestation, look for the following signs:
- Round exit holes in wooden structures
- Powdery wood dust near holes or on the ground
- Visible tunnels or galleries inside the wood (sometimes visible if the wood is cut open or severely damaged)
- Adult beetles flying around or resting near wooden surfaces
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