Lyctid Powderpost Beetle

Lyctid powderpost beetles, family Lyctidae, are secondary wood-boring pests almost exclusively confined to the sapwood of hardwoods with high starch content. Adults are slender, elongated, somewhat flattened, reddish-brown to black, and typically 2-7 mm in length. Their head is visible from above, and antennae have a two-segmented club. Females lay eggs in the pores of wood vessels, preferring unfinished or coarse-sawn timber. Larvae are C-shaped, creamy white, and grub-like, with a distinct posterior spiracle. The life cycle can range from 3 months to over a year, dependent on temperature, humidity, and the nutritional content of the wood. Best development occurs at 26-300C and 10-20% wood moisture.

Adult lyctid beetles are primarily nocturnal, attracted to lights, and disperse via flight. Females are highly selective in oviposition, only laying eggs in wood pores large enough to accommodate the egg-laying apparatus, which limits their hosts to ring-porous hardwoods and some diffuse-porous species. Larvae tunnel extensively through the sapwood, packing their galleries with very fine, flour-like frass. Unlike bostrichids, lyctid beetles can re-infest the same piece of wood for multiple generations, exacerbating damage.