Found holes in a used log bed, hutch, or table at an estate sale, Facebook Marketplace, or antique barn? Before you buy, you need to know if those marks are active insect damage, old dead-bug history with no live threat, or intentional factory distressing that adds to the piece's character. These three things look similar in photos. They are not the same problem.
Live infestation. Buying this piece risks spreading wood-boring insects to your home, cottage, or outbuildings. Walk away or demand professional treatment with documentation.
Insects are gone. The holes are historical. Wood is structurally weakened depending on severity, but no live spread risk. Price negotiation territory, not a dealbreaker.
Intentional marks applied during manufacturing. No insects were ever involved. Common on barnwood, reclaimed, and rustic-style pieces. Pure cosmetic character.
1–2 mm perfectly round: Anobiid powderpost beetles (most common in Canadian furniture). These are the default suspect in any used rustic piece. 3–5 mm round: Bostrichid powderpost beetles or old house borer larvae. 5–10 mm with oval shape: Old house borer or cerambycid; these can do serious structural damage. Larger ragged exits: Larger cerambycids or horntails — serious problem. Shallow surface tracks: Often ambrosia beetle or aesthetic worm-tracking used in barnwood processing. Deep geometric dents: Ball-peen hammer, chain, or chisel — factory distressing, no insects involved.
This is the single most useful quick test. If the inside of the hole is the same color as the finished surface, the hole was there when the finish was applied — the finisher coated over it intentionally. That strongly suggests factory distressing or old pre-finish infestation the maker was aware of. If the inside is raw pale wood and the surface is dark or finished, something made that hole after the finish went on. Fresh holes through a finish coat on a used piece are the most concerning scenario.
Fine pale free-flowing powder is fresh frass — classic powderpost beetle activity. If you tap the piece and powder falls out, that is active or very recent. Compacted darkened residue inside holes is old frass — insects are likely gone but the evidence remains. No frass at all happens with both factory distressing (no insect ever present) and with very old infestations that have been cleaned out or where the frass has long since settled. Clean holes alone do not rule out old insect damage.
Finish coats are applied once, early in the piece's life. Any mark that has finish inside it or over it existed before finishing. Any mark with raw wood at the edges and no finish inside it came later. For used furniture, marks through a finished surface with raw wood visible inside = post-manufacture = happened during ownership, not at the factory. That is the scenario that most needs investigation.
Insects don't use rulers. If the marks are evenly spaced, same angle, same depth, symmetrically distributed across the surface — that's a tool, not a beetle. If the holes are concentrated near end grain, joints, or underneath where moisture might accumulate — that's insect behavior. Insects prefer end grain, sapwood, and high-moisture areas. They don't arrange themselves attractively.
Most wood-boring beetles in Canada overwinter as larvae inside wood and emerge as adults in spring. A piece stored in an unheated garage, barn, or seasonal cottage from October through April is exposed to conditions that allow eggs to develop. A piece that has lived its whole life in a heated year-round home has had fewer opportunities for re-infestation, though it could have arrived with eggs already in it. Storage history narrows probability — it doesn't eliminate the need to physically inspect.
Distressing is intentionally applied during manufacture to make new or reclaimed wood look aged and worn. Common techniques include:
The telltale of factory distressing is that the marks look considered — consistent depth, covered by finish, distributed for aesthetic effect rather than concentrated where wood is most vulnerable. There's usually nothing inside the holes.
If your decoder result points toward possible active infestation:
Old insect damage is common in antique and vintage rustic furniture. It doesn't mean the piece is dangerous or worthless — it means insects were present at some point, did their work, and are gone. What you need to assess is structural impact:
Old damage is a price negotiation. It is not automatically a dealbreaker unless it affects structural members in a piece you plan to actually use.