House Longhorn Beetle

Natural Habitat

Found in seasoned timber and dry wood of buildings, primarily softwoods like pine, spruce, and fir.

Diet & Feeding

Adults do not feed; larvae consume cellulose from the sapwood of dry treated or untreated softwoods.

Behavior Patterns

Mostly active during the day; females lay eggs in wood crevices; larvae bore deep into wood for several years before pupating.

Risks & Benefits

A major structural pest that can cause significant damage to building roof timbers and floors; ecologically, they help decompose dead softwood in the wild.

Identified on: 6/25/2026