Termites get all the attention. They’re the villains in every pest control commercial, the reason home inspectors pause dramatically in crawl spaces, and the insect homeowners fear most. But termites are far from the only creatures capable of turning your structural beams into sawdust.

Several other wood-destroying insects cause significant—sometimes irreversible—damage to homes, furniture, and timber structures every year. The tricky part? Many of them look nothing like termites, leave different signs, and require entirely different treatment approaches. Misidentifying the culprit is one of the most common reasons pest problems spiral out of control.

This guide covers the most destructive wood-boring insects beyond termites: what they look like, how to spot an infestation, which wood they target, and what to do when you find them.

Why Correct Identification Matters

Treating a carpenter ant infestation like a termite problem won’t work. The same goes for confusing powderpost beetles with wood-boring beetles or assuming all wood damage comes from the same source. Each insect has distinct biology, behavior, and vulnerabilities.

Getting the identification right from the start saves money, prevents further damage, and ensures treatment actually reaches the source of the problem.

Carpenter Ants

Carpenter ants are among the most misidentified wood-destroying insects in North America. Homeowners often mistake them for termites—especially during swarming season when both species produce winged reproductives.

How to tell them apart from termites:

• Carpenter ants have a narrow, pinched waist; termites have a thick, uniform body
• Carpenter ant wings are unequal in length; termite wings are equal
• Carpenter ants have bent (elbowed) antennae; termites have straight, bead-like antennae

The damage they cause:

Unlike termites, carpenter ants don’t eat wood. They excavate it to build galleries for nesting, which means they push out coarse, fibrous sawdust called frass—often mixed with dead insect parts and soil. You’ll typically find this debris near baseboards, windowsills, or below wall voids.

Carpenter ants prefer soft, moisture-damaged wood. Finding them usually signals an underlying moisture problem—a leaky pipe, a compromised roof line, or poor ventilation in a crawl space.

Where to look:

• Window and door frames
• Roof eaves
• Deck posts and wooden steps
• Areas near plumbing

Powderpost Beetles

Powderpost beetles are small, but their impact is significant. These insects lay eggs inside the pores of hardwood, and their larvae spend months—sometimes years—tunneling through the wood before emerging as adults. By the time you see the exit holes, the damage inside is already extensive.

Signs of a powderpost beetle infestation:

• Small, round exit holes (1/32 to 1/4 inch, depending on species)
• Fine, flour-like powder (frass) beneath or around the holes
• Weakened or crumbling wood surface

There are three main families of powderpost beetles: Lyctids, Bostrichids, and Anobiids. Lyctid beetles target hardwoods like oak, ash, and walnut—which is why antique furniture and hardwood flooring are particularly vulnerable. Anobiid beetles (also called furniture beetles) will attack both hard and softwood and are notorious for damaging structural timbers in older homes.

Key distinction: The frass left by powderpost beetles is very fine and powdery—almost like talc. This is different from the coarser frass produced by carpenter ants or the mud-like tubes built by termites.

Old House Borers

Despite the name, old house borers don’t exclusively target old houses. What they do target is softwood lumber—particularly pine, spruce, and fir—which makes them a real threat to the structural framing of modern homes.

Old house borers are longhorned beetles in their adult form, typically ½ to 1 inch long with grayish-brown coloring and long antennae. The larvae, however, are the true destructors. They can remain active inside wood for 3 to 12 years, chewing large oval tunnels through the grain.

Signs of an infestation:

• Oval exit holes, roughly 1/4 to 3/8 inch wide
• Rippling or blistering on wood surfaces caused by larvae tunneling just beneath
• A rhythmic ticking or rasping sound coming from walls (larvae chewing)
• Coarse, granular frass packed into tunnels

Because infestations can persist silently for years, old house borers are particularly insidious. Re-infestation is also common—adult females are drawn back to wood they’ve previously infested.

Carpenter Bees

Carpenter bees are easy to spot in spring: large, black-and-yellow bees hovering near wooden eaves, decks, or fences. Males are territorial and may dive-bomb nearby humans, but they lack stingers. The real damage comes from the females.

Female carpenter bees bore near-perfect round holes (approximately ½ inch in diameter) into unfinished or weathered wood to create nesting tunnels. A single tunnel extends about an inch deep before turning sharply and running with the grain for several inches.

How to identify carpenter bee damage:

• Perfectly round entry holes, about ½ inch across
• Yellow-brown staining from pollen and waste below the hole
• Sawdust-like frass on surfaces beneath entry points
• Woodpeckers aggressively pecking at the same area (they’re after the larvae inside)

While a single nesting pair causes limited damage, carpenter bees reuse and expand existing tunnels year after year. Over time, a small number of entry holes can become a network of tunnels that compromises structural integrity.

Most targeted woods:

• Cedar
• Redwood
• Pine
• Unfinished or weathered softwood decking

Wood-Boring Weevils

Wood-boring weevils are less commonly discussed but worth knowing. These small beetles (identifiable by their long, distinctive snout) target wet or fungus-infected wood almost exclusively. If you’re finding them, the infestation is telling you something important: the wood is already compromised by moisture.

They’re most commonly found in subfloor timbers, joists, and any structural wood in contact with the ground or in poorly ventilated spaces. Because they require wood with a high moisture content, addressing the underlying damp issue is just as critical as treating the infestation itself.

How to Tell One Pest from Another: A Quick Reference

Insect	Entry/Exit Holes	Frass Appearance	Wood Preference
Carpenter Ants	Galleries, no true exit holes	Coarse, fibrous	Moist/damaged wood
Powderpost Beetles	Tiny, round holes	Very fine powder	Hardwood or softwood
Old House Borers	Oval holes	Coarse, granular	Softwood (pine, fir)
Carpenter Bees	Round, ½-inch holes	Sawdust-like	Unfinished softwood
Wood-Boring Weevils	Small, irregular	Fine to coarse	Wet, fungus-infected wood

When to Call a Professional

Some infestations are manageable with targeted treatments—surface borate applications, for example, work well against powderpost beetles in exposed wood. Others, like a long-established old house borer infestation inside structural framing, require professional intervention and possibly fumigation.

Call a licensed pest control professional if:

• You’re unsure which insect is responsible
• The affected wood is structural (joists, beams, load-bearing walls)
• The infestation appears widespread
• DIY treatments haven’t resolved the issue after 4–6 weeks

A certified inspector can identify the species, assess the full extent of the damage, and recommend a treatment plan tailored to the specific insect and the type of wood affected.

Prevention Strategies That Actually Work

The most effective defense against wood-destroying insects is reducing the conditions they need to thrive.

Moisture control is the single biggest factor. Fix leaks promptly, ensure crawl spaces are ventilated, and keep gutters clear to prevent water pooling near the foundation.

Wood finishing and sealing discourages carpenter bees and powderpost beetles from targeting exposed wood. Regularly paint or stain outdoor timber, and replace any weathered or deteriorating wood before insects move in.

Proper storage of firewood, lumber, and antique furniture matters too. Store firewood at least 20 feet from the home, off the ground, and inspect antique pieces before bringing them indoors.

Routine inspections—especially in crawl spaces, attics, and around wooden decking—catch problems early, before minor damage becomes a structural concern.

Don’t Assume It’s Termites

Every wood-destroying insect leaves its own fingerprints: distinctive holes, specific frass, preferred wood types, and characteristic damage patterns. Recognizing those differences is the first step toward effective treatment.

If you’ve found wood damage in your home, resist the urge to assume the worst and reach for the first termite treatment you can find. Take time to examine the evidence carefully. The right identification leads to the right solution—and far less wasted time, money, and structural damage in the long run.

Tags: Carpenter Ants, Powder Post Beetles, Weevils, Wood-Destroying Insects That Aren't Termites