The term "powderpost beetle" describes several small beetles that bore into wood and produce a fine, flour-like powder as a result of their efforts. Beetle larvae damage the wood as they eat through it, making tunnels before they emerge as adults one to five years later.
The two common types of powderpost beetles are the lyctid and anobiid. Hardwoods, such as oak, ash, walnut and hickory, are susceptible to lyctid beetles. Damage is most often found on door frames and windows, in wood paneling and molding, and in flooring and furniture. In addition to hardwoods, the anobiid beetle destroys maple, poplar and pine woods that are generally used as structural supports, such as beams, joists, subflooring and studs.