How to Prevent Carpenter Bees

During spring and summer, pest activity peaks, and unfortunately, increased pest activity can create significant problems – like property destruction. Carpenter bees are a type of solitary bee that can damage wooden structures, including homes and other buildings. Although they do not pose a significant physical threat to humans, they can be a nuisance and cause substantial damage to wooden structures over time. If you are looking to prevent carpenter bees from damaging your property, there are several measures you can take.

What Are Carpenter Bees?

Carpenter bees, native to North America, are most known for their distinctive nesting habits. They are often mistaken for bumblebees because of their similar appearance, but they have markedly different behaviors. Carpenter bees do not live in hives. These solitary insects bore holes into wooden structures where they lay eggs and raise their young, usually in the early spring months.

Carpenter bees aren’t the only pests that damage wooden structures. In order to properly address your concerns, it’s vital to understand what kind of pest has invaded your property.

Signs of a Carpenter Bee Infestation

Carpenter ants, termites, and carpenter bees all damage wooden structures – but how can you know which pest is the culprit? Several common signs can indicate a carpenter bee infestation. 

One of the most obvious (and concerning) is carpenter bee damage. Unlike termite damage that resembles horizontal shelving along wood grains, carpenter bee damage presents as round holes, usually about half an inch in diameter, in wooden structures such as eaves, decks, or fences. These holes are typically smooth and clean-cut, and may have sawdust or wood shavings around them.

Another sign of a carpenter bee problem is an unusual uptick in bee swarming, particularly during the spring and summer months. You may also notice increased woodpecker activity, as these birds are attracted to carpenter bee larvae that live inside the holes created by adult bees. Finally, you may hear buzzing coming from inside the wood, caused by the movement of the bees within their tunnels as they tend their young.

Ways to Prevent Carpenter Bees

There are several ways to prevent carpenter bees from damaging your property.

Don’t leave wooden surfaces unfinished. One of the most effective ways to ward off carpenter bees is to paint or treat any wooden structures on your property with a varnish or topcoat, especially if they harden the surface of the wood. Carpenter bees prefer soft wood, and most finishes and paint create enough of a barrier to deter these pests.

Consider applying pesticides or DIY remedies. You can also use insecticides available at home improvement stores or natural repellents like citrus oil to deter carpenter bees. These pesticides and natural remedies aren’t always effective, though, and can be dangerous if applied incorrectly.

Remove dead and decaying wood. Rotting wood is easy for carpenter bees to bore into. Decaying logs, fallen trees, and stumps can all serve as breeding grounds for carpenter bees and other wood-destroying insects.

Plug carpenter bee nests. If you have an active infestation, you may be able to prevent bees from returning by plugging their nests. Once you’ve identified carpenter bee holes, fill them in with wooden dowels, putty, or caulk. After the nests are plugged, carpenter bees will be unable to enter or exit. This method can be effective for preventing a carpenter bee nest from growing, but it may not deter new bees from boring additional holes.

Use carpenter bee traps. Finally, you can install traps or netting around your property to prevent carpenter bees from nesting in your property. The traps mimic the ideal home for a carpenter bee — a soft pine box with a small hole — but siphon the bees into a bottle or jar attached to the bottom where they cannot escape. These carpenter bee traps and nets can be placed over the entrances to potential nesting sites, restricting access.