Woodworm refers to the larvae of any wood-boring beetle, rather than one particular species. In the UK, the most common are the Common Furniture Beetle, Deathwatch Beetle , House Longhorn Beetle and Powderpost Beetle . All invade and consume wood, and then leave when they have reached maturity.
Tell tale signs of woodworm include:
Small round holes in your woodwork, similar to the holes in a dart board.
Fine, powdery dust around these holes (this is known as frass).
Crumbly edges to boards and joists.
Adult beetles emerging from the holes or present around the house.
Even if you can't see any holes, you might also find frass escaping from the back or underside of old furniture. Again this suggests active woodworm.