How to Get Rid of Powderpost Beetles (2025)

The presence of powderpost beetles is often first revealed by small, unexpected piles of powder near wood surfaces or materials and/or small holes (called exit holes) in the wood. If you are noticing piles of fine powder, this could definitely be cause for concern. Powderpost beetles are often brought into homes inside some sort of wood material, including building materials, wood furniture, or firewood.

The name "powderpost beetle" comes from the powder (aka frass) these insects leave behind—this actually their larvae that cause the most damage. These larvae, also known as woodworms, voraciously eat through the wood from the inside, creating tunnels (or galleries) inside the wood. As adults, they chew out of the wood and emerge through small round exit holes.

Here you’ll learn how to identify powderpost beetles and get rid of them.

What Do Powderpost Beetles Look Like?

The name powderpost beetle is used for a wide variety of wood-boring beetles, including true powderpost beetles (Lyctinae), false powderpost beetles (Bostrichidae), and deathwatch beetles (Anobiidae). While there are a number of similarities and differences between types of powderpost beetles, all of them invade and damage wood items, which can include different plants and items including trees, structural wood, bamboo furniture, and decorative wooden items.

These adult beetles are small (1/16 to 1/4 inch) and vary in coloring in shades of brown and red.

Types of Powderpost Beetles

True powderpost beetles, false powderpost beetles, and deathwatch beetles are all wood-boring beetles, and they all look relatively similar to one another. You may be able to tell precisely what kind of beetle infestation you have by looking at the beetles' backs.

True Powderpost Beetles (Lyctinae)

True powderpost beetles can have a more elongated appearance. If you look down on their back from above, you can see their head and eyes.

False Powderpost Beetles (Bostrichidae)

Most adult false powderpost beetles are small and range in size from 1/8 to 1/4 inch, but some species found in the wild can be up to two inches long. Their coloring is dark, ranging from brown to black, and some have reddish body parts, such as antennae, legs, and mouthparts. False powderpost beetles have a hump-backed appearance. If you look down on their backs from above, you cannot see their head and eyes easily.

Deathwatch Beetles (Anobiidae)

Though their name is a little strange, these beetles are actually related to various stored-pantry pests, including the cigarette beetle and the drugstore beetle. Deathwatch beetles typically range in size from 1/8 to 1/4 inch and are reddish to dark brown. Like false powderpost beetles, they have a hump-backed appearance and when you look down on their backs from above, you cannot see their head and eyes easily.

What Causes Powderpost Beetles?

While the cause of powderpost beetles really depends on what type of powderpost beetle you're dealing with, the short answer is that the beetles wanted to lay their eggs in the pores of something wooden. Powderpost beetles come from wood (or bamboo) materials that haven't been properly treated or protected against potential infestation. They are commonly brought into homes via building materials, wood furniture, or firewood.

Signs of Powderpost Beetles

Powderpost beetles either start as eggs inside the pores of wood or burrow into the wood to lay eggs. This can make early detection incredibly difficult, as you can't actually see inside the wood where the activity is taking place. Some of the first clues of a powderpost beetle infestation are small and unexpected piles of frass piling up around wood items, as well as exit holes in the wood.

The signs of powderpost beetle activity and the type of wood they attack vary, depending on the type of beetle.

True Powderpost Beetles

Female true powderpost beetles emerge and lay their eggs on untreated wood surfaces or cracks. They deposit their eggs in the pores of wood where they will be protected.

• Attack hardwoods, including hickory, ash, oak, walnut, and mahogany.
• Most commonly found in door and window framing, plywood, furniture, flooring, as well as bamboo (although bamboo is actually a grass, it has large pores that are ideal for adult female beetles to lay their eggs).
• Produce an extra fine, smooth frass.
• Exit holes tend to be all the same size.

False Powderpost Beetles

Adult female false powderpost beetle behavior differs from that of other powderpost beetles. They burrow into the wood instead of laying eggs on the surface or looking for cracks. After creating tunnels (also called egg galleries), they will find a pore or crack inside the wood to deposit their eggs into. Due to this behavior, they will also burrow into other materials if it means laying their eggs in a safe place. This is how they have earned alternative names such as the leadcable borer or cask borer.

• Infestat both hardwoods and soft woods, though they are more commonly found in hardwoods. Some species of Bostrichidae beetles come from imported tropical woods such as bamboo, certain types of mahogany, and some firewood. Some species are also found in dying walnut and oak tree branches and ornamental hardwood trees, such as eucalyptus.
• Capable of burrowing into wood and non-wood materials that include plaster, soft metals such as lead and silver, metal-coated electrical/telephone cables, and wine-soaked oak barrels and corks.
• Produce the grittiest and most coarse frass of the three groups of powderpost beetles, with the texture feeling similar to soap flakes.
• Frass is visible in the exit hole but difficult to dislodge due to its texture.
• Exit holes are all about the same size.

Deathwatch Beetles

These beetles lay their eggs in the pores on the surface of wood or in exposed, cracked wood as opposed to burrowing into the wood first.

• Primarily infest softwoods, their favorite being Douglas fir, which is often used in support beams (ceiling, foundation, etc.) and furniture.
• Prefer old or decaying wood as it's moist wood and beetles are found more commonly in damp environments.
• Frass consists of very small pellets that are more coarse than true powderpost beetle frass, but not as coarse as frass from false powderpost beetles.
• Exit holes can be of various sizes, unlike the other two powderpost beetle families.

Tests to Identify the Signs

If you cannot tell what type of beetle you have based on looking at them, try the ballpoint pen test or the frass test:

The Exit Hole Test: Insert the tip of a ballpoint pen into the exit holes you see. Compare the holes to the descriptions below to try to determine what type of creature may be making them.

• True Powderpost Beetle: The holes are all about the same size and the exit hole is small, so only the very tip of the pen fits.
• False Powderpost Beetle: The exit holes are all about the same size and the entire point of the pen fits into the exit hole.
• Deathwatch Beetle: The holes vary in size and fit both the tip of the pen as well as the angled part of the top of the pen.
• Drywood Termite: Some of the holes are filled with mud, which can camouflage them and make them difficult to see at all.

The Frass Test: Examine the frass closely, using a pen tip or other tool if necessary to dislodge some from the exit holes. Compare the appearance, texture, and consistency of the frass to the below to try to determine what might be causing the holes.

• True Powderpost Beetle: Smooth and fine frass, similar to the texture of flour
• False Powderpost Beetle: Frass is incredibly gritty and difficult to dislodge from exit hole
• Deathwatch Beetle: Gritty, coarse frass that feels like soap flakes
• Drywood Termite: Large, granular pellets with ridges on the sides, similar in texture to ground pepper

2 Ways to Get Rid of Powderpost Beetles

Spotting holes in the wood inside your home or on your furniture doesn't necessarily mean that you have powderpost beetles, though, and it doesn't mean that you have an active infestation, especially if the holes you are seeing are in wood that is sealed, varnished, or stained. It could be powderpost beetles, and it could be an active issue, but it could also be old and inactive. The first and most important step in dealing with a wood-destroying pest is determining what pest is responsible for the damage or activity you're noticing. This will help determine what treatment is required.

If you suspect there could be powderpost beetles in your home, it is important to address these concerns quickly. More often than not, the activity you're seeing is nothing to worry about, but on the off-chance that you're dealing with wood-boring beetles, the issue will be less severe the faster you address it.

Remove Infested Wood

If you are certain you have an active wood-boring beetle issue, it is always ideal to remove, destroy, and replace any infested wood, especially when structural wood is involved. Always check wood around the infested wood for holes, as well. Infested wood can be burned or taken to a dump. When replacing the wood, don't forget to inspect building materials (and any free firewood) before bringing it indoors.

Try a Temperature Treatment

Both hot and cold temperatures will kill off powderpost beetles. Wooden items that are small and do not have any fabric, felt, or fur attached can be heated for six hours in an oven at 120°F to 135°F. Items can also be frozen in a deep freezer for a minimum of three days at 0°F. If the item is more than two inches thick, it could take longer than three days to adequately freeze treat wood-boring beetles.

How to Prevent Powderpost Beetles

Prevention is the best strategy for keeping powderpost beetles away, as wood-boring beetles are difficult to detect and challenging to manage once an active infestation is established. Sanitation is key in preventing a powderpost beetle issue.

• When purchasing lumber or other goods made of wood, make sure is kiln-dried (this only kills off active pests and does not prevent re-infestation).
• Remove destroy dead trees and tree limbs from your yard, especially near stored wood products and wood piles.
• Remove infested wood from your home, garage, barns, etc.
• Use special pest-control lighting around wood storage areas.

When to Call a Professional to Treat a Powderpost Beetle Infestation

In severe cases or when removal and heat treatment are not possible, chemical treatment such as fumigation of infested furniture will likely be necessary. Be sure to shop around and find an Integrated Pest Management Specialist if you need professional pest help. There are very effective and safe professional quality products containing sodium borate that will kill wood-boring beetles and protect wood in your home from a variety of wood-destroying pests for years to come.