You can find Box Elder Beetles nesting on boxelder, maple, and ash trees during the warmer months. In winter they migrate to homes and buildings for shelter. They enter through cracks and crevices, find a nesting spot, and hibernate through the cold season. They stay in the warmest areas and emerge by heat sources. Box Elder Beetles are considered a nuisance pest since they don’t cause significant damage to buildings. However, their droppings leave stains on linens and furniture.
In the Spring, adult beetles congregate in groups, also called aggregations, and find a host plant where they can live and breed. They eat leaves, flowers, twigs, and pierce plant tissue to extract juices, causing minimal damage to the host tree.