What are boxelder bugs, and where are they found in Ontario?

Boxelder bugs are black insects with red or orange markings, commonly found around boxelder, maple, and ash trees. In Ontario, they invade homes, cottages, and businesses in the fall while seeking shelter for winter.

Are boxelder bugs harmful to people or pets?

They are not dangerous but can be a major nuisance. They do not bite or sting, but their waste can stain walls, curtains, and furniture.

When do boxelder bugs appear in Ontario homes, cottages and businesses?

They typically show up in late summer through fall as they look for warm structures to overwinter. They may re-emerge indoors during sunny winter days.