Boxelder Bug

Commonly found on boxelder, maple, and ash trees. They often congregate on the sunny south or west sides of buildings, rocks, and trees to stay warm.

They feed primarily on the seeds, leaves, and soft twigs of female boxelder trees, but also occasionally on maple and ash. They suck plant juices using piercing-sucking mouthparts.

They are known for forming large, conspicuous social aggregations during the fall as they seek overwintering sites. They undergo incomplete metamorphosis (egg, nymph, adult). In winter, they enter diapause and often move indoors into wall voids of houses.

They are considered a nuisance pest rather than a threat. They do not bite, sting, or cause significant damage to most plants or structures, though their excrement may stain fabrics. They provide a food source for some birds and spiders.