The Uninvited Fall Guests in Your Home
As the warm summer days fade into cooler fall evenings, many homeowners start to notice unfamiliar insects clustering around windows, doors, and sunny walls. One common intruder during this seasonal shift is the Boxelder Bug—a pest known more for its nuisance factor than any direct harm. But don’t let their harmless reputation fool you—left unchecked, these bugs can become a serious seasonal problem.
What Are Boxelder Bugs?
Boxelder bugs (Boisea trivittata) are black insects with striking red or orange markings on their wings and thorax. They grow to about half an inch long and are most commonly found on or around boxelder trees, maples, and ash trees. Despite their name, they’re not exclusive to boxelder trees and can infest a variety of other plants.
Why Are They Considered Pests?
Boxelder bugs are primarily nuisance pests. They don’t bite, sting, or cause structural damage to your home—but that doesn’t mean they should be ignored:
1. Seasonal Invasion: In the fall, these insects seek warmth and shelter, often invading homes in large numbers. They squeeze through tiny cracks and gaps around windows, doors, and vents.
2. Staining and Odor: When crushed, boxelder bugs release a foul-smelling liquid that can stain walls, curtains, and furniture. Their droppings may also leave unsightly marks.
3. Overwintering Behavior: Once inside, boxelder bugs tend to hibernate in wall voids and attics. On warm winter days, they may become active again—crawling around your home and creating year-round annoyance.
Signs of an Infestation
• Clusters of red and black bugs around sunny exterior walls
• Swarms near doors, windows, or foundation cracks
• Bugs flying or crawling inside the house, especially near windows
• Staining on curtains or light-colored surfaces
Prevention and Control
1. Seal Entry Points: Use silicone or silicone-latex caulk to seal gaps around windows, doors, utility pipes, siding, and vents. Install door sweeps and weather stripping to block access.
2. Reduce Attraction: Boxelder bugs feed on seeds and leaves from boxelder and maple trees. Removing female boxelder trees (which produce seeds) can help reduce populations.
3. Vacuum Indoor Pests: If you find boxelder bugs inside your home, avoid crushing them. Instead, use a vacuum with a disposable bag to remove them safely.
4. Professional Treatment: For large or recurring infestations, a licensed pest control service can apply targeted treatments around entry points and harboring areas to eliminate and prevent further invasions.
At Pestwise, we understand how frustrating a seasonal boxelder bug invasion can be. Our professional technicians are trained to identify, treat, and prevent infestations using safe and effective methods. Whether it’s a one-time service or a year-round prevention plan, we’ve got you covered.
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