Hello 59murphy,

You can deter boxelder bugs, but the most effective strategies—according to university extension research—focus on exclusion, removing attractants, and targeted outdoor treatments. Here’s a clear, evidence‑based breakdown drawn from .edu extension sources.

PLEASE READ THE INFORMATION AT THE LINK BELOW:

Boxelder bugs: A real nuisance during spring - MSU Extension

Be sure to read and follow all instructions and safety precautions found on the label before using any pesticide.

Most Effective Deterrents (Based on University Extension Guidance)

1. Seal and Exclude (Top Recommendation)

Multiple extensions emphasize that exclusion is the single most reliable long‑term solution.

Seal cracks around siding, windows, doors, soffits, and foundations.

Install or repair screens on windows, attic vents, and crawl spaces.

Pay special attention to south- and west-facing walls, which boxelder bugs prefer for warmth.

This prevents them from entering and reduces clustering on the exterior.

2. Reduce Attractants (Especially Female Boxelder Trees)

Female boxelder trees produce the seeds that boxelder bugs prefer. Removing them is the most permanent population‑reduction method, though not always practical.

Removing female boxelder trees can significantly reduce local populations.

Bugs may also feed on maple, ash, and various fruit trees, but these are less critical attractants.

If tree removal isn’t an option, focus on exclusion and targeted treatments.

3. Natural / Low‑Toxicity Options

University extensions note a few non‑synthetic or low‑risk approaches:

Soapy water sprays: Laundry detergent or dish soap solutions can kill boxelder bugs on contact when sprayed directly on clusters. This is safe, inexpensive, and effective for spot treatment.

Hot water (165–180°F): Purdue Extension reports that hot water applied directly to clusters kills them quickly. Use caution to avoid burns or surface damage.

These methods won’t prevent future bugs from occurring, but they reduce current bug counts.

4. Pesticide Options (When Needed)

Extensions generally recommend pesticides only as a supplemental measure, and mainly outdoors.

Tree sprays (late summer): Carbaryl (Sevin) or permethrin products can be applied to infested trees while nymphs are still concentrated and easier to control.

Perimeter sprays: Applying a labeled insecticide to exterior surfaces where bugs congregate (siding, foundations, sunny walls) can reduce clustering. Effectiveness varies, and exclusion is still more reliable.

Once bugs are inside, pesticides are not recommended—physical removal is the only practical method.

5. Remove Outdoor Hiding Spots

Boxelder bugs overwinter in sheltered areas. Reducing these helps:

Clear leaf piles, stacked wood, rocks, and debris near the foundation.

Trim vegetation touching the house.

Keep the south side of the house free of clutter.

Putting It All Together

If you want the best combination for Michigan spring conditions, here’s the priority order:

Seal exterior gaps (most effective, long-term).

Use soapy water sprays on clusters as they appear.

Clear debris and reduce hiding spots near the home.

Consider tree management if female boxelders are nearby.

Use perimeter insecticides only when needed and apply them outdoors.

I hope this helps!