Woodworm
Also called: furniture beetle, insect attack
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Woodworm is the common name for holes and damage made when beetle larvae tunnel through timber.
Judge the damage
Woodworm attack does not automatically make a piece unusable. Structural damage is often slight, but a load-bearing member still deserves a careful assessment rather than a decision based only on the number of visible holes.
Do not confuse the sign
The marks may resemble damage from the common furniture beetle, a different timber insect. That resemblance can make sounder wood look suspect, so identify the cause and judge the actual loss of material before deciding what the timber can do.