Birch Catkin Bug

Natural Habitat

Widely found on birch trees (Betula spp.) and other deciduous trees, often entering homes in large numbers during autumn as they seek shelter for overwintering.

Diet & Feeding

Mostly feeds on the seeds found within birch catkins, using piercing-sucking mouthparts to extract nutrients.

Behavior Patterns

They are active from spring through autumn. During the fall, they aggregate in large numbers on buildings and may enter homes through small cracks. They produce a distinct, somewhat unpleasant odor when disturbed or crushed.

Risks & Benefits

They are harmless to humans, pets, and structures. They do not bite or sting. Their primary impact is as a seasonal nuisance when they enter homes in large numbers. In the ecosystem, they serve as a food source for birds and predatory insects.

Identified on: 6/18/2026