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Boxelder Bugs
Boxelder bugs are a predictable part of autumn in Southeastern Wisconsin. As temperatures drop in cities like Milwaukee and Waukesha, these pests leave their host trees to seek warmth, often turning the sunny sides of homes into gathering spots. While harmless, their sheer numbers make them a significant nuisance during the fall migration.
What Do Boxelder Bugs Look Like?
These insects are easily identified by their black bodies with distinct reddish-orange lines forming a 'V' shape on their backs. They are roughly 1/2 inch long and have an oval, flattened body. You will typically find them clustering near boxelder, maple and ash trees during the summer before they move to structures in the fall.
Why Do Boxelder Bugs Congregate on Houses?
Boxelder bugs gather on south and west-facing walls to absorb heat from the afternoon sun. They are looking for a warm place to survive the freezing Wisconsin winter. Once they warm up, they seek out cracks in siding, gaps around windows and vents to enter wall voids and attics where they hibernate.
How to Get Rid of Boxelder Bugs Inside
If they are already inside, the most effective removal method is vacuuming. Suck them up with a hose attachment and immediately dispose of the bag in an outside trash bin. Avoid squashing them, as their body fluids can stain fabrics and walls.
When is the Best Time to Spray for Boxelder Bugs?
Prevention is the only long-term solution. A professional barrier treatment applied to the exterior of the home from late September through October stops them before they enter. Once the frost hits and they are settled inside your walls, they are difficult to remove until they emerge in spring.
What Scents Repel Boxelder Bugs?
Strong scents like mint, clove and lavender naturally repel these insects from potential entry points. Additionally, spraying a simple solution of dish soap and water around window sills or door thresholds adds another layer of defense against minor infestations.