Powderpost Beetle
Wood Destroyers

Powderpost Beetle

Lyctus spp. / Anobium spp.

Quick ID Markers

1Small round exit holes, 1/32"–1/8" diameter
2Fine, flour-like powdery frass (key ID — not pellets)
3Frass falls loosely from holes — not packed in galleries
4Adult beetles small (1/16"–1/4"), reddish-brown to black
5Often discovered when frass appears on shelves or floors below infested wood

Habits & Biology

Larvae bore through hardwood (Lyctids) or seasoned softwood (Anobiids), consuming the wood from inside while leaving a thin outer surface intact. Adults emerge through round holes. Infestations often introduced on new lumber or secondhand furniture. Anobiid beetles require higher moisture content.

Typical Hiding Areas

Hardwood floors, furniture, antiques, structural hardwood, seasoned softwood in crawlspaces and attics.

Signs of Activity

Fine powdery frass accumulating below wood
Small round exit holes in wood surfaces
New holes appearing despite previous treatment
Frass same color as wood (blends in)
Hollow sound when wood is tapped — galleries consumed interior

🗓️ Seasonality

Adults emerge spring through summer. Larvae active year-round. Exit holes appear when new adults emerge.

⚠️ Mistaken Identity

Drywood Termite (hard six-sided pellets, not powder)Old House Borer (larger oval holes, coarse frass)Carpenter Ant (coarse sawdust-like frass with insect parts)

🧪 Treatment Plan

Powderpost beetle control focuses on moisture reduction for Anobiid species, borate treatment of accessible wood, and removal/replacement of heavily infested material.

Widespread structural infestations in inaccessible areas may require professional fumigation.

New, bright, clean frass indicates active infestation. Darkened, caked frass may be old. Vacuum old frass, wait 2–4 weeks, and check for new frass to confirm activity.

New frass is light-colored and fine — matches the wood color
Old holes can be sealed with paint or wood filler to track new emergence

Prevention After Treatment

  • •Inspect secondhand furniture and lumber before use
  • •Apply borate to bare wood during construction
  • •Maintain crawlspace humidity below 50%
  • •Never use unseasoned wood in finished structures
© 2026 PestProdiy. All rights reserved.
pestprodiy.comYouTubeFacebookInstagramTwitter/XTikTokPinterestReddit
This application is an independent educational resource and is not affiliated with or endorsed by any government agency.
⚠️ AI-assisted identification reviewed by a licensed applicator. Always verify critical information before acting.