POWDERPOST BEETLES spend months or years inside wood in the larval stage. Their presence is only apparent when they emerge from the wood as adults, leaving pin hole openings behind and piles of powdery frass below. The term ‘powderpost’ comes from the fact that the larvae of these beetles feed on wood and, given enough time, can reduce it to a mass of fine powder. They are therefore considered pests. If wood conditions are right, female beetles may lay their eggs and reinfest the wood, continuing the cycle for generations. Heavily-infested wood becomes riddled with holes and rooms or basements packed with a dusty frass â€” wood that has passed through the digestive tract of the beetles.