Boxelder Bugs vs. Stink Bugs: Which Fall Pest Is in Your Home?

As temperatures begin dropping across Western Massachusetts and Connecticut, you may notice unfamiliar insects gathering on sunny exterior walls or appearing near your windows. Two common culprits are boxelder bugs and stink bugs.

Although both pests invade homes in the fall to escape colder weather, they have different appearances and habits. Here is how to identify the unwanted guests—and what you can do to keep them outside.

How to Identify a Boxelder Bug

Adult boxelder bugs are approximately half an inch long. Their narrow, oval bodies are mostly black, with distinctive reddish-orange lines along their backs and wings. Younger boxelder bugs, called nymphs, are smaller and usually bright red.

As their name suggests, these insects are commonly associated with boxelder trees. They may also feed on maple and ash trees. During warm fall days, large groups often gather on the sunny sides of buildings, rocks, and tree trunks.

Boxelder bugs do not typically bite people or cause significant structural damage. However, they can become a considerable nuisance when large numbers enter a home. If crushed, they may release an unpleasant odor and leave reddish stains on curtains, walls, carpeting, and furniture.

How to Identify a Stink Bug

The brown marmorated stink bug is slightly larger and broader than a boxelder bug. Its shield-shaped body has a mottled brown or gray appearance, with light-colored bands along its antennae and the edges of its abdomen.

The easiest way to distinguish these pests is by their shape and markings:

• Boxelder bugs have narrow black bodies with red or orange lines.

• Stink bugs have broad, shield-shaped bodies with mottled brown coloring.

Stink bugs get their name from the strong odor they release when threatened or crushed. Like boxelder bugs, they generally do not bite, spread disease, or damage a home’s structure. However, they can gather indoors in substantial numbers and create persistent odor problems.

Outdoors, stink bugs may also damage fruits, vegetables, and ornamental plants by feeding on them.

Why Do These Bugs Enter Homes in the Fall?

Boxelder bugs and stink bugs are known as overwintering pests. When fall temperatures fall, they begin looking for protected places where they can remain until spring.

Small openings around a home can provide easy access. Common entry points include:

• Gaps around windows and exterior doors

• Damaged screens

• Openings around utility lines and pipes

• Cracks in siding or the foundation

• Unscreened vents

• Gaps beneath rooflines and around soffits

Once inside, the insects may hide in wall voids, attics, crawl spaces, and other quiet areas. Heating systems and sunny winter days can sometimes cause them to become active, leading homeowners to discover bugs near windows and light fixtures.

Seeing one or two insects does not necessarily indicate a serious infestation. Frequent sightings, however, may mean many more are hiding inside the building.

Should You Crush Boxelder Bugs or Stink Bugs?

Avoid crushing either pest indoors. Stink bugs can release their characteristic odor, while boxelder bugs may stain household surfaces.

Instead, remove isolated bugs with a vacuum cleaner and empty the contents into a sealed outdoor trash container. A vacuum used to collect numerous stink bugs may temporarily retain their odor, so avoid using an expensive household vacuum for a large infestation.

Indoor removal can address the insects you see, but it will not eliminate pests hidden inside walls or prevent new ones from entering.

How to Keep Fall Invaders Outside

Exclusion is one of the most effective ways to prevent boxelder bugs and stink bugs from entering your home. Before cold weather settles in:

1. Seal cracks around the foundation, siding, windows, and doors.

2. Replace damaged screens and weatherstripping.

3. Install door sweeps beneath exterior doors.

4. Screen attic, soffit, and utility vents appropriately.

5. Seal openings where pipes, cables, and wires enter the building.

6. Repair loose siding and gaps around the roofline.

7. Vacuum existing pests instead of crushing them.

Pay special attention to the south- and west-facing sides of your home. These surfaces receive more afternoon sunlight and frequently attract insects looking for warmth.

Homeowners should use care when sealing an older property. Some openings may be necessary for ventilation, while others can be difficult to locate without a detailed inspection.

When to Call a Pest Control Professional

Boxelder bugs and stink bugs are primarily nuisance pests, but large numbers can be frustrating to manage. Once they have settled inside wall voids, store-bought sprays and surface treatments may provide limited results.

Professional help may be appropriate if:

• Large groups regularly gather on your home

• Bugs repeatedly appear indoors

• You cannot locate their entry points

• An infestation returns every fall

• The insects are affecting customers, tenants, or employees at a business

The best time to address overwintering pests is before they establish themselves indoors.

Protect Your Home From Fall Pests

Whether you are seeing red-and-black boxelder bugs or shield-shaped stink bugs, American Pest Solutions can help. Our experienced team serves homeowners and businesses throughout Western Massachusetts and Hartford County, Connecticut.

We begin with a careful inspection, identify the pest and its likely entry points, and recommend a treatment and prevention plan suited to your property. We also offer year-round protection against common household pests through our Pest Guard Plan.

Contact American Pest Solutions today to request service and keep unwanted fall visitors out of your home.