Powderpost beetle

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. Because of this behavior, they are considered pests. These beetles can survive in colder climates.

Powderpost beetle larvae spend months or years inside wood while developing, feeding mainly on the starch content. Their presence is only apparent when they emerge as adults, leaving behind pinhole-sized openings, often called "shot holes". They may also leave piles of powdery frass below. Shot holes normally range in diameter from 1⁄32 inch (0.79 mm) to 1⁄8 inch (3.2 mm), depending on the species of beetle. If wood conditions are right, female beetles may lay their eggs and re-infest the wood, continuing the cycle for generations.

Powderpost beetles feed on deciduous trees, including certain hardwoods or softwoods depending on the species. Some hardwoods are naturally immune if they have low starch content or if their pore diameters are too small for the female beetle's ovipositor to lay her eggs in.

Wood preservatives can be used to prevent beetle infestation. Common treatments may use borate, and frequently structural fumigation.

Items that can be infested by powderpost beetles include wooden tools or tool handles, frames, furniture, gun stocks, books, toys, bamboo, flooring, musical instruments, and structural timbers. One instance of a 2023 American-made Fender guitar containing powderpost beetle larvae was reported in 2026, after the larvae had tunneled their way out and left small holes in the ash body.