🦗 Boxelder Bugs
Every autumn in Wisconsin, boxelder bugs, Asian lady beetles, and stink bugs seek warmth inside homes by the thousands. Once inside, they're difficult to remove and can leave stains and odors. The key is stopping them at the perimeter before they get in — timing is everything.
Boxelder Bugs
Black with distinctive red/orange markings on their back, 1/2" long. Elongated, somewhat flattened body. When crushed, they release a strong, unpleasant odor that can stain fabrics and surfaces.
What to Look For
Large clusters of bugs on sunny exterior walls (south and west facing) in September–October. Bugs appearing indoors on warm winter days. Stains on walls, curtains, and light fixtures where bugs have been crushed.
When to Watch Out
Boxelder bugs are a fall-specific problem in Wisconsin. In September and October, they congregate on sun-warmed exterior walls and seek entry into wall voids and attics to overwinter. They become inactive during winter but may reappear indoors on warm days. In spring, they emerge and return outdoors.
How to Prevent Boxelder Bugs
Professional Treatment Process
Timing Assessment
We monitor temperatures and schedule treatment for the optimal window — typically late August to mid-September — before bugs begin massing on exterior walls.
Exterior Barrier Treatment
A residual insecticide is applied around the entire perimeter: foundation, windows, doors, soffits, and known entry points. This kills bugs on contact as they land and prevents them from entering.
Entry Point Sealing
We identify and flag gaps, cracks, and unsealed utility penetrations that bugs use to enter. Sealing these provides an additional layer of protection.
Interior Treatment (if needed)
For homes with active overwintering populations already inside wall voids, we apply targeted treatments to eliminate bugs that made it past the barrier.
Boxelder Bugs FAQ
Deal with Boxelder Bugs Now
Call us today for a free inspection. We'll identify the extent of the problem and recommend the right treatment — with no obligation to proceed.