How to Differentiate Between New and Old Powderpost Beetle Damage

Powderpost beetles don’t always make a dramatic entrance like termites or carpenter ants. But over time, they can cause significant damage to wooden structures, furniture, and flooring.

The challenge for homeowners? Telling whether the damage is active or old.

At Specter Pest Control, we regularly inspect homes where beetle activity has left its mark. One of the first things clients ask is: “Is this still happening, or is it in the past?” That distinction matters—a lot. If the activity is ongoing, it requires prompt attention. If it’s old, you might not need treatment at all.

Let’s walk through how to spot the difference between new and old powderpost beetle damage—and when to call in the pros.

What Are Powderpost Beetles?

Powderpost beetles are a group of wood-boring insects that lay their eggs in cracks and pores of unfinished or untreated wood. When the larvae hatch, they tunnel through the wood as they feed, eventually emerging as adults and leaving behind tiny round holes and fine powdery sawdust (called frass).

They prefer hardwoods like oak, ash, and hickory—so they often show up in flooring, furniture, baseboards, and structural beams.

Unlike termites, they don’t eat the entire wood structure, but they can still reduce strength and cause cosmetic damage over time.

Signs of Powderpost Beetle Activity

Both old and new infestations can leave behind similar physical signs:

• Tiny round exit holes (1/32″ to 1/8″ in diameter)

• Light, flour-like frass around or below the holes

• Wood that feels brittle or has a spongy texture near damage

So how can you tell if the infestation is still active?

Clues That Point to New Powderpost Beetle Damage

Here’s what our team at Specter Pest Control looks for during inspections:

1. Fresh Frass (Wood Dust)

Newly active beetles push out frass as they emerge. If you see clean, light-colored powder that hasn’t been disturbed or collected dust, that’s a strong sign of ongoing activity.

Try lightly sweeping up the frass and checking again in a few days. If new powder appears, you’re likely dealing with an active infestation.

2. Crisp Edges on Exit Holes

Fresh exit holes tend to have sharp, clean edges with no signs of wear or paint buildup. Older holes often appear duller and may have paint or stain around the perimeter.

3. Seasonal Timing

Powderpost beetles typically emerge in late spring or summer. If you notice new holes or dust during these months, it increases the chance that the activity is recent.

4. Humidity and Temperature Conditions

These beetles thrive in warm, humid environments. If your home or crawlspace recently experienced high moisture levels, conditions may have triggered a new wave of activity.

Signs That Damage Is Old and Inactive

Not every set of holes or wood damage is cause for concern. Here’s how to tell if the infestation has already run its course:

• No new frass appears after cleanup

• Exit holes look worn or covered with stain or sealant

• There are no signs of larvae or beetles during inspection

• Damage hasn’t changed over time, especially if noted years ago

In many cases, powderpost beetle infestations happened during wood storage or prior to construction. Once the wood was sealed or treated, the problem stopped—but the exit holes remain as evidence.

If that’s the case, no treatment is needed. But it takes a trained eye to know for sure.

When to Bring in a Pest Control Professional

Because powderpost beetle damage can linger long after the infestation ends, it’s smart to get a professional opinion before jumping into repairs or treatments.

At Specter Pest Control, we provide:

• Thorough inspections of attics, crawlspaces, hardwoods, and framing

• Moisture and humidity checks

• Identification of beetle species and life cycle stage

• Tailored treatment plans if activity is confirmed

We use safe, targeted options like borate-based treatments and controlled fumigation, depending on the extent of the infestation.

More importantly, we take the time to explain what we find and whether any action is actually needed. Our goal is to protect your home—not upsell unnecessary services.

Prevention Tips to Keep Beetles From Returning

Once beetles are gone, keeping them away is the next step. Here’s what we recommend:

• Seal unfinished wood with a proper finish or paint

• Control moisture in basements, crawlspaces, and attics

• Inspect reclaimed wood or antiques before bringing them inside

• Use a dehumidifier in humid climates to discourage larvae development

Even small habits, like improving ventilation or fixing a slow leak, can make a big difference.

Final Thoughts: Don’t Panic—Get the Facts

Finding powderpost beetle damage in your home is unsettling. But it doesn’t always mean you have an active infestation. Understanding the difference between old and new damage is key to avoiding unnecessary worry—or worse, unnecessary repairs.

If you’re unsure what you’re looking at, Specter Pest Control is here to help. Our team combines experience, local knowledge, and clear communication to guide you toward the right solution.

Schedule your free home inspection today and get answers you can trust.