Birch Catkin Bug

Natural Habitat

Deciduous woodlands and urban areas, specifically associated with birch (Betula) and occasionally alder or rhododendron trees.

Diet & Feeding

Herbivorous; they primarily suck the sap and nutrients from the seeds and catkins of birch trees.

Behavior Patterns

They overwinter as adults in crevices or under bark and emerge in spring to breed. They are often seen in large numbers on birch catkins during late summer and can occasionally enter homes in autumn seeking shelter.

Risks & Benefits

They pose no risk to humans or pets as they do not bite or sting. While they can be a nuisance in large numbers, they are a minor component of the ecosystem, providing food for insectivorous birds.

Identified on: 3/3/2026