Box elder bugs are a common nuisance for homeowners, particularly as the weather cools in the fall. These pests are named for their preference for boxelder trees, but they will readily infest other types of homes in search of a warm place to overwinter. Understanding their behavior is the first step in effective control, as these insects congregate in large numbers on the sunny sides of buildings, attempting to slip through any available crack or crevice.
Identification: Recognizing the Enemy
Before you learn how to get rid of box elder bugs, you must be able to identify them accurately. Adult bugs are about half an inch long with a distinctively flat, elongated oval body. They are usually black with striking red or orange markings along the edges of their wings and on their heads. Nymphs, the younger insects, are bright red and wingless, which can sometimes lead to confusion with other pests like carpet beetles.
Why They Invade Your Space
Box elder bugs are not seeking food or water inside your home; they are looking for warmth and shelter. As the temperatures drop in late summer and early fall, they gather on the south and west-facing walls of structures to absorb the sun's heat. They are then driven inside through small gaps around windows, doors, utility lines, and foundation cracks, often ending up in wall voids or attics where they remain dormant until spring.
Prevention: Sealing the Entry Points
The most effective way to manage these pests is to prevent them from entering in the first place. Since they are so small, even holes the size of a dime are potential entry points. Focusing on exclusion methods protects your home without the use of harsh chemicals.
Inspection and Maintenance Tips
- Carefully inspect the exterior of your home, especially near the roofline, for any cracks or gaps.
- Check window and door frames for worn weatherstripping and replace it if necessary.
- Seal openings where pipes, cables, or wires enter the building foundation with a high-quality caulk or steel wool.
- Ensure that screens on windows and vents are intact and fit tightly without tears.
Removal: Handling an Existing Infestation
If box elder bugs have already established themselves inside your living space, removal becomes the priority. The key is to be gentle and avoid crushing them, as crushing releases a pungent odor and leaves behind a difficult-to-remove yellow staining liquid.
Safe Removal Strategies
For visible bugs on sunny days, a vacuum cleaner is one of the most efficient tools. Use a hose attachment to suck them up, and immediately seal the vacuum bag or empty the canister into a sealed plastic bag to prevent them from escaping back into the room. Alternatively, you can manually sweep them into a dustpan and dispose of them outside. A mixture of water and soap can be sprayed directly on outdoor gatherings to help dislodge them from siding.
Outdoor Management: Reducing the Population
To reduce the number of bugs attempting to enter your home, it helps to manage their population outside. While they do not cause significant damage to trees, their sheer numbers can be overwhelming.
Landscape and Maintenance
- Remove any fallen seeds or debris from boxelder, ash, or maple trees, as these attract feeding bugs.
- Rake up and dispose of any mulch or plant matter that has accumulated near the foundation.
- Consider planting less attractive vegetation away from the exterior walls of your home.
Chemical Control: When to Use Pesticides
Chemical treatments are generally a last resort for box elder bug control due to the difficulty of reaching nests within wall voids. However, they can be useful for protecting the perimeter of your home before the insects attempt to enter.
Application Guidelines
Focus on applying a residual insecticide to the exterior walls of your home, targeting the areas where you observed the most activity in previous years. Treat the foundation, windows, and doorways, creating a barrier that insects contacting the surface will carry back to their harborage sites. Always read and follow the label instructions carefully, keeping the product away from plants you intend to keep and ensuring proper ventilation if applying near intake vents.
Professional Intervention: Knowing When to Call for Help
If the infestation is severe, or if you are uncomfortable dealing with pesticides, contacting a licensed pest control professional is a sensible option. Experts have access to more potent commercial-grade products and the expertise to apply them safely. They can also conduct a thorough inspection to identify all potential entry points and seal them effectively, providing long-term relief from these seasonal invaders.
