Finding small, perfectly round holes in an antique dresser — or a fine, flour-like dust on the floor beneath a wooden table — is rarely good news. In Connecticut homes, the culprit is almost always the powder post beetle , a wood-destroying insect that often shows up in furniture long before homeowners realize anything is wrong. The damage is quiet, slow, and easy to miss until it has already spread.

The bigger concern isn't always the furniture itself. It's what happens when the infestation moves into the walls, floors, and structural beams around it. In this guide, we'll cover how powder post beetles end up in furniture in the first place, how to tell active damage from old damage, what it means when you start seeing holes in your walls, and what professional treatment actually looks like in a Connecticut home.

1. How Powder Post Beetles End Up in Furniture

Powder post beetles lay their eggs in unfinished wood. The larvae bore inside, feed for one to five years, and emerge as adults — leaving behind those characteristic exit holes. Because the entire life cycle plays out inside the wood, infested furniture often looks perfectly fine for years before the first hole appears. By the time you spot one, the next generation may already be feeding inside the same piece.

This is why we see infestations most often in older or seasonally-used pieces. The wood was likely infested before it was milled, sold, or built into furniture. The beetles simply emerged later, in your home, after the cycle finally completed. It's a problem that travels with the wood, not something that started in your living room.

The pieces most commonly affected include:

• Antique furniture — older pieces made from oak, ash, hickory, or walnut, which are high in the starches beetles prefer
• Reclaimed wood — barn-board tables, salvaged beams, rustic décor, and farmhouse pieces
• Vacation homes and summer cottages — properties that sit closed for months at a time, giving infestations room to develop unnoticed
• Stored heirlooms — items kept in attics, basements, garages, or rental units

In Connecticut specifically, this comes up most often in older homes across Litchfield County, in shoreline cottages from Guilford to Old Lyme, and in lake houses around Bantam, Candlewood, and Waramaug that aren't occupied year-round. The seasonal nature of these properties is part of what allows the problem to take hold quietly.

2. Signs You're Looking at an Active Infestation

Old damage and active infestations look similar at a glance, and many homeowners assume the holes they see are leftover from decades ago. Sometimes they are. Other times they're brand new, and another generation of beetles is already inside the wood, getting ready to emerge. Knowing the difference matters because only active infestations need treatment.

Here's what tells them apart:

• Fresh exit holes are 1/16" to 1/8" wide, pale or light-colored on the inside, and clean-cut around the edges. Older holes tend to be darker inside, weathered, and sometimes filled with dust or grime.
• Frass — the fine, flour-like sawdust beneath infested wood — is the clearest active sign. If you wipe it away and it comes back within a few weeks, the infestation is live.
• New holes in new places is the most important warning. If holes are appearing in trim, baseboards, window sills, or beams that weren't there before, the beetles have moved beyond the original piece.
• Spring emergence — adult beetles typically emerge from April through June in Connecticut, which is when infestations become visible. If you're noticing new activity this time of year, it's worth a closer look.

If you're not sure whether what you're seeing is old or active, that's a normal thing to bring to an inspection. A trained technician can tell the difference quickly and confirm whether treatment is needed at all.

3. When Furniture Beetles Spread to Structural Wood

This is the part most homeowners don't expect. Powder post beetles don't always stay in the piece they came in on. Adult beetles can fly short distances and lay new eggs in any unfinished wood nearby — including flooring, joists, sills, paneling, framing, and trim. Once that happens, the problem stops being about a single piece of furniture and starts being about the house itself.

When we get calls about beetles in furniture and a few small holes in the wall nearby, it usually means the infestation has already spread. The wall holes don't appear at the same time as the furniture holes — they show up months or even a year later, after a new generation has matured inside the structural wood. By then, the beetles may be in multiple places at once.

Left untreated, powder post beetles can compromise structural wood the same way termites do — just more slowly. The damage tends to be concentrated in joists, subfloor, and exposed beams, and it can go on for years before it becomes visible from outside the wood. For homeowners who already understand the threat of wood-destroying pests, our guide to why termite inspections matter covers similar ground and is worth reading alongside this one.

4. Treatment Options for Connecticut Homes

How we treat a powder post beetle problem depends on how far it has spread, and the right approach can range from a single-piece treatment to a whole-structure plan. Most calls fall somewhere in the middle. The first step is always an inspection to figure out exactly what we're dealing with.

Common treatment options include:

• Localized furniture treatment — for a single piece or a small cluster, residual treatments, controlled heat, or freezing can eliminate the beetles without affecting the rest of the home. This is often the right call for newly-discovered infestations that haven't spread.
• Targeted structural treatment — when beetles have moved into trim, joists, or framing, we treat the exposed wood directly using borate-based products that penetrate the surface and remain effective for years. This is the most common scenario we see in older homes and summer cottages.
• Whole-structure approach — reserved for widespread infestations, typically in older homes or vacation properties that have gone untreated for years. This involves more extensive treatment and a longer service window.

Treatment pricing for wood-destroying insects is calculated by square footage, with a minimum charge that reflects setup, materials, and follow-up visits. For a deeper look at what early-stage powder post beetle damage looks like and how it's identified, see our companion post on identifying and treating powder post beetle damage.

5. When to Call a Professional

Not every old hole in a wooden surface needs an exterminator. But certain signals should prompt a call, especially this time of year when adult beetles are emerging across Connecticut. It's worth scheduling an inspection if any of the following applies:

• You've found holes in more than one piece of furniture, particularly if they're in different rooms
• You're seeing holes in walls, trim, or structural wood , even just a few
• The issue is in a vacation home, summer cottage, or rental you only visit periodically
• You're not sure whether the damage is old or active and want a definitive answer
• You've found fresh frass that returns after cleanup

ProSource Pest Solutions provides free pest inspections throughout our Connecticut service area, including Southington, Cheshire, Wallingford, Farmington, Avon, West Hartford, Waterbury, and the surrounding communities within roughly a 15-mile radius. A technician will identify whether the infestation is active, where it has spread, and what treatment will actually solve it — without overselling anything you don't need. If you're also thinking about long-term prevention, our post on sealing your home from pests covers the exclusion steps every homeowner should know.

Schedule a Free Inspection

If you've spotted powder post beetle holes — in furniture, in trim, or in structural wood — don't wait to see how far they'll spread. The earlier we catch an active infestation, the less treatment it takes to solve, and the less risk to the rest of your home.

Call ProSource Pest Solutions at (860) 419-4559 or contact us online to schedule a free inspection. We treat the problem at its source, not just the symptoms.