Eastern Boxelder Bug

Found primarily near Boxelder trees, but also maple and ash tree varieties; often seen on the sunny southern side of buildings during autumn.

Mostly seeds from Boxelder trees, but they also feed on the leaves and flowers of maple and ash trees; they use piercing-sucking mouthparts to extract sap.

They are social insects often found in large aggregations. They undergo incomplete metamorphosis (egg, nymph, adult) and seek warm, sheltered spaces like wall voids or attics to overwinter.

Generally harmless to humans and structures, though they can be a significant nuisance when they invade homes in large numbers. They may leave small stains on fabric with their excrement and emit a foul odor if crushed. They do not bite or sting normally and cause negligible damage to host trees.