Western Conifer Seed Bug

Natural Habitat

Found in coniferous forests and surrounding areas; commonly enters houses, garages, and attics in the fall to seek shelter for overwintering.

Diet & Feeding

Insects in this species use piercing-sucking mouthparts to feed on the sap from developing cones and seeds of various conifer trees, particularly Douglas-fir and pine.

Behavior Patterns

They are known for being active in late summer and fall. They fly well and can produce a loud buzzing sound. They often emit a pungent, citrus-like defensive odor when disturbed or crushed.

Risks & Benefits

They do not bite, sting, or carry diseases, making them harmless to humans and pets. However, they are considered a nuisance pest when they enter homes in large numbers. Ecosystem-wise, they can reduce the seed yield of conifer trees.

Identified on: 3/29/2026