Birch Catkin Bug (nymphs or shed skins)

Natural Habitat

Found on birch trees, particularly on or around the catkins (seeds), but frequently enter homes in autumn seeking shelter.

Diet & Feeding

Feed on the seeds of birch, alder, and sometimes rhododendrons by sucking plant juices.

Behavior Patterns

Aggregates in large numbers during the fall to find overwintering sites; they are attracted to light and warmth, which often leads them into houses.

Risks & Benefits

Harmless to humans and pets; they do not bite or transmit disease. They can produce a faint unpleasant odor if crushed and are considered a nuisance pest rather than a structural threat.

Identified on: 6/18/2026