Boxelder Bug

Commonly found on Boxelder trees (Acer negundo), but also maple and ash trees. During fall, they frequently congregate on the sunny sides of buildings and move indoors to overwinter.

Primarily feed on the low-protein juices found in the seeds, leaves, and soft twigs of Boxelder trees, and occasionally maple or ash.

They are gregarious, often clustering together in large groups. They undergo a simple metamorphosis (egg, nymph, adult). In autumn, they seek out warm crevices to hibernate, often becoming a household nuisance.

Generally considered harmless to humans and trees. They do not sting or transmit disease, and they don't cause significant damage to the host trees. Their main 'risk' is being a nuisance pest when they invade homes in large numbers.