Wood Borer Holes in Doors and Frames: What to Do

Tiny round holes in a wooden door or frame, sometimes with a little pale powder beneath, are the calling card of wood borers. They are easy to ignore, but the larvae inside can hollow out wood over time, and frames fixed into walls are hard and costly to replace.

This guide explains what to do.

The short answer

Small round holes in wooden doors and frames, typically 1 to 3 mm across, are usually exit holes made by adult wood borer beetles leaving the wood, after larvae have tunnelled inside. Fresh, clean-edged holes with fine powder nearby suggest active borers, while old, dusty holes with no powder may be from past activity. Check by cleaning the area and watching for new powder, tap the wood for hollow sounds, and look at other items. Treatment involves professional injection and surface treatment of the wood, followed by filling, polishing and moisture control. Act early to protect the wood.

What the holes tell you

• The beetles have completed a lifecycle in the wood, and could do so again.
• More holes mean heavier infestation.
• Larvae may still be inside, even if no beetles are seen.

Active or old?

1. Fresh holes: Clean, light-edged, with fresh pale powder nearby.
2. Old holes: Darkened, dusty, with no powder.
3. Test: Clean the area, place dark paper beneath, and check after a week. New powder means activity.
4. Seasonal: Beetles emerge at certain times of year, so new holes may appear then.

Check the extent

• Tap along the door and frame with a screwdriver handle. A hollow or dull sound suggests tunnelling.
• Probe suspect spots with a screwdriver tip. Soft or crumbling wood is a concern.
• Check the hidden faces, edges, hinges and the bottom of the frame.
• Check nearby furniture and other timber.

What to do

1. Photograph the holes and powder.
2. Clean the powder and monitor for new signs.
3. Call a professional for identification, since termites can also damage frames and need different treatment.
4. Have the wood treated by injection into holes and surface application suited to the borer.
5. Fill holes and repair damaged areas after treatment.
6. Refinish with a suitable polish or paint to protect the wood.

If the frame is structurally weak

Heavily damaged frames may need strengthening or replacement. Ask a carpenter and the pest professional for advice.

Prevention

• Keep wood dry, and fix leaks and damp walls.
• Maintain polish or paint, and seal exposed edges.
• Use treated timber for new frames.
• Inspect doors and frames yearly.

Borers or termites?

Mud tubes and soil-lined galleries indicate termites, not borers. Check carefully, or ask a specialist.

When to call a professional

If you see holes and powder, call a professional soon. Early treatment saves wood.

Frequently asked questions

Can I just fill the holes?

Filling hides the signs but does not kill larvae inside.

Will new polish stop borers?

It does not reach larvae already inside.

How long until damage is serious?

It varies. Heavy infestations can weaken wood over years.

Do I need to replace the door?

Not necessarily. Treatment can save many doors.

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.