Frass Gallery: Comparing Wood Borer, Termite and Carpenter Ant Debris

Debris near wooden items is one of the first clues that something is eating the wood. Different pests leave different debris, and recognising it helps you choose the right action.

The short answer

Wood borer frass is fine, flour-like or gritty powder, often under tiny round holes. Drywood termite frass is small, hard, six-sided pellets that look like grains or coffee grounds, while subterranean termites leave mud tubes rather than frass. Carpenter ants leave coarse, sawdust-like shavings mixed with insect parts. Check texture, shape, colour and location, and call a professional if unsure.

Wood borer frass

• Fine to gritty, soft powder.
• Pale or the colour of the wood.
• Appears in small heaps under round holes.

Termite signs

• Drywood termites: small, hard, six-sided pellets.
• Subterranean termites: mud tubes and soil-lined galleries.
• Damaged wood often looks layered and hollow.

Carpenter ant debris

• Coarse, shaving-like sawdust.
• Often contains insect parts or food residue.
• Smooth, clean galleries inside wood.

How to compare

1. Collect a small sample on paper.
2. Feel the texture and look at the shape with a magnifier.
3. Note colour and location.
4. Check for holes, tubes or ants nearby.
5. Photograph everything and share it with a professional.

When to call a professional

If the problem is widespread, keeps returning or you are unsure what you are dealing with, a professional inspection will save time and avoid wasted effort.

Frequently asked questions

Can I identify frass myself?

Often, but a professional is more reliable.

Is all powder from borers?

No. Dust and plaster can look similar.

Does frass show active infestation?

Fresh, recurring frass does.

Which is worse?

Termites can be faster, but all need action.

This guide is part of IPest's complete resource on wood borer control. For identification help, prevention and treatment options, see our full wood borer treatment guide for Bangalore.