Western Conifer Seed Bug

Natural Habitat

Found in coniferous forests and surrounding areas; commonly enters homes and buildings in autumn to seek shelter for the winter.

Diet & Feeding

Feeds on the Developing seeds and flowers of various coniferous trees (such as pine, Douglas-fir, and hemlock) using piercing-sucking mouthparts.

Behavior Patterns

Nymphs and adults are active during the warmer months on host trees. In late summer and autumn, adults aggregate and seek overwintering sites. When disturbed, they can produce a pungent odor as a defense mechanism.

Risks & Benefits

They do not bite, sting, or cause structural damage to homes, though they are considered a nuisance pest indoors. They can potentially reduce seed yields in commercial conifer seed orchards.

Identified on: 4/8/2026