Boxelder Bug Control - 1-866-453-7221 Regal Pest Control

Boxelder Bug Control in Southeast Michigan

Boxelder bugs are a seasonal nuisance pest that gathers on homes in large numbers each fall as temperatures drop. They spend the winter in wall voids, attics, and other protected spaces, then show up inside on warm days in late winter and early spring when they start moving again.

They do not bite, sting, or damage the structure. The problem is volume. A home near a female boxelder or silver maple tree can see hundreds of them on a sunny wall in a single afternoon, and a portion of those will find their way inside.

Timing matters more than anything else with this pest. Once they are inside the walls, there is very little that can be sprayed to reach them. The work that pays off is an exterior treatment before they move in, paired with sealing the gaps they use.

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Signs You Have a Boxelder Bug Problem

Most calls we take start with one of these.

Clusters on sunny walls

Dozens or hundreds of bugs packed onto south and west-facing siding, brick, or foundation on warm afternoons in September and October.

Bugs at the windows indoors

Slow-moving bugs on sills and around light fixtures during a winter thaw. They are almost always overwintering adults coming out of the wall, not a new infestation.

Staining on siding or curtains

Their excrement leaves small yellow-orange spots that can stain light-colored siding, drapes, and painted trim when populations are large.

Boxelder or maple trees nearby

A female boxelder, silver maple, or ash on or near the property is very likely the source. Activity drops off quickly the farther a home sits from the host tree.

Same weeks every year

Late August through October outside, then again in February and March inside. A problem that repeats on that schedule is almost certainly boxelder bugs.

Gaps around doors and windows

Torn screens, worn weatherstripping, gaps behind shutters, and openings where siding meets trim are the entry points they use most.

Where They Are Found

South and west-facing exterior walls

Boxelder, maple, and ash trees

Wall voids, attics, and soffits

Window and door frames

Under siding, shutters, and trim

Garages, sheds, and detached buildings

Identification

Boxelder bugs get confused with other fall invaders. Here is how to tell them apart.

Boxelder Bug (adult)

About 1/2 inch long. Black with red or orange lines on the shoulders and along the wing edges, forming an X when the wings are folded. Flat and oval.

Boxelder Bug (nymph)

Bright red and wingless, smaller than the adult, with a rounded segmented abdomen. Usually seen in groups on tree trunks and seed pods in summer.

Asian Lady Beetle

Round and dome-shaped, orange to red with black spots and an M-shaped mark behind the head. Overwinters in walls too, often on the same walls at the same time of year.

Brown Marmorated Stink Bug

Shield-shaped, mottled brown, about 5/8 inch, with light bands on the antennae. Releases an odor when crushed or vacuumed.

Western Conifer Seed Bug

Longer and narrower, brown, about 3/4 inch, with flared leaf-like segments on the back legs. Feeds on pine and spruce seeds rather than maple seeds.

Boxelder and maple trees food source Michigan

The Food Source

Boxelder bugs feed mainly on the winged seeds of female boxelder trees, and also on silver maple and ash. Homes within a block or two of those trees see the heaviest activity.

The Boxelder Bug Year

Knowing where they are in the cycle is what determines the right service.

Spring

Overwintering adults leave the structure on warm days, some of them through the inside of the home. They move to host trees and lay eggs.

Summer

Red nymphs develop on and under boxelder and maple trees. Populations build through the season with little activity on the house.

Late Summer and Fall

Adults gather on warm walls and begin looking for a way in. This is the window where exterior treatment does the most good.

Winter

They sit dormant in wall voids and attics. Warm spells pull them out, usually into the living space rather than back outdoors.

How We Treat

Boxelder bug work is an exterior job. Here is what a technician does on site.

Inspection

We walk the exterior to find the source of the activity, which is very often a female boxelder or silver maple on or near the property. We note the walls where they are gathering and the gaps around windows, doors, siding, and utility penetrations they are using to get in.

Exterior treatment

The product we will be using is applied to the walls where they are congregating, the foundation, and around windows, doors, soffits, and eaves. Timing is the key part. Treating before they start moving into the structure gives a much better result than treating after.

Entry point recommendations

We point out the openings that matter most and what it would take to close them. Sealing gaps in siding, replacing worn weatherstripping, and repairing screens cuts the number that get inside for years, not just for one season.

Ongoing coverage

On a service plan, the fall visit is timed for this pest, and if they come back between visits we return at no charge. For homes with a heavy source tree nearby, that repeat coverage is usually what keeps the numbers down long term.

One thing worth knowing. Spraying indoors does very little for boxelder bugs. The ones you see inside in winter are coming out of the wall void, and a surface spray will not reach them there. Vacuuming them up is the better answer indoors, and the real fix is the exterior work done at the right time of year.

See our service plans for ongoing coverage

What You Can Do

These steps make a real difference between treatments.

Seal gaps around window frames, door frames, and where siding meets trim
Replace worn weatherstripping and repair torn screens before fall
Caulk around utility lines, dryer vents, and outdoor faucets
Check that attic and soffit vents are screened
Vacuum the ones you find indoors instead of crushing them, since crushing can stain
Rake up seed pods under boxelder and maple trees in fall
Consider removing a female boxelder tree if it sits close to the house
Watch south and west walls in September and call at the first cluster

FAQ

Do boxelder bugs cause damage?

Boxelder bugs do not bite, sting, or damage the structure. Large numbers indoors are a nuisance. Their excrement can leave yellow-orange stains on light-colored siding, curtains, and trim when the population is large.

Why are there so many on my house?

They are drawn to warm, sun-exposed surfaces in fall while looking for a place to spend the winter. South and west-facing walls take the brunt of it. A home near a female boxelder tree, silver maple, or ash will very likely see higher numbers than a home a few blocks away.

When is the best time to treat?

Late summer into early fall, before they start working their way into the structure. An exterior treatment at that point significantly reduces the number that get in. Treating after they are already in the walls gives a much weaker result, which is why the call in September beats the call in February.

Why do I only see them inside in the winter?

They spend the winter dormant in wall voids and attics. A warm spell wakes them up and they head toward light and warmth, which often puts them in the living space instead of back outside. They are not breeding indoors, so what you are seeing is the population that moved in the previous fall.

Can I just spray them inside?

Indoor spraying does very little here. The bugs are inside the wall, not on the surface where the product goes. Vacuuming is the practical answer indoors. The lasting fix is exterior treatment at the right time of year plus sealing the openings they use.

Do I need to cut down my boxelder tree?

Not necessarily. Removing a female boxelder close to the house will reduce local numbers over time, but it is not required for us to get results. Plenty of homes with a host tree nearby stay comfortable with fall treatment and good exclusion. If a neighbor's tree is the source, removal is not an option anyway, and treatment becomes the main tool.

Will one treatment take care of it?

A well-timed fall treatment usually brings a big drop in activity. Because boxelder bugs come back from the same host trees every year, most homes with a steady source do better with ongoing coverage than with a single service. We will tell you which one fits your situation after the inspection.

Are they dangerous to pets or kids?

They are not considered dangerous. They do not bite or sting, and they are not known to carry disease. A pet that eats one may drool or have a brief upset stomach, but that is the extent of it in most cases.

Do you treat commercial buildings?

Yes. We handle apartment buildings, condo associations, offices, warehouses, and retail properties throughout Southeast Michigan. Large sun-exposed walls on commercial buildings tend to draw heavy fall clusters, and the approach is the same: treat the exterior early and address the openings.

Other Pests We Treat

Ants

Bed Bugs

Beetles

Carpenter Bees All Pests

Covered Under Our Service Plans

Boxelder bugs are covered under our service plans, which protect against over 20 pest types with no contract and unlimited free re-services between visits.

See Service Plans

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