Asian Lady Beetles in Your House? How to Stop Them

If you've seen what looks like a swarm of ladybugs on your siding this month, take a closer look. Chances are they're Asian lady beetles, and they're not here to eat aphids in your garden. They're here to spend the winter in your house.

Every fall they gather by the hundreds on sun-warmed siding across the tri-state, from Huntington to Ashland to Ironton, then slip into attics, wall voids, and window frames through gaps you can't see from the ground. The good news: they're easy to tell apart from ladybugs, and easy to keep out once you know how.

Asian lady beetle vs. ladybug: how to tell the difference

They look related because they are, but a few clues separate them at a glance:

The "M" on the head. Asian lady beetles have a white head with a black M-shaped (or W-shaped) marking right behind the eyes. Native ladybugs have a black head with white cheeks and no M.
Shape. Ladybugs are rounder, like a half-dome. Asian lady beetles are longer and more oval.
Color and spots. Ladybugs are typically red-orange with seven black spots. Asian lady beetles vary in color, from tan to orange to red, and can have anywhere from zero to nineteen spots, so a spot count alone won't tell you.
Behavior. This is the big one. Ladybugs overwinter outside, singly or in small groups. Asian lady beetles mass together on sunny walls and try to get into your house. If you're seeing dozens on one side of your home, it's not ladybugs.

Why they pick your house and whether they're harmful

Asian lady beetles are overwintering pests. In late summer and early fall, they fly to warm, sunlit walls, usually the southwest side of a house, then work their way in through soffit gaps, vents, window frames, and roof flashing.

They won't damage your home, and they don't breed indoors. What they will do is show up in numbers: hundreds clustering on curtains, in light fixtures, and around windows on warm winter days. When disturbed, they release a yellowish, smelly fluid that can stain walls and fabric, and they can give a light pinch. For most people they're a nuisance; the bigger problem is that once a population finds your house, they come back year after year.

How to keep them out

The sealing checklist is the same one we give for stink bugs. These two pests use the same entry points:

Caulk gaps around windows, doors, siding seams, and where utility lines enter the house.
Make sure soffits, ridge vents, and attic vents have fine mesh screens.
Fix or replace worn door sweeps and garage door bottom seals.
Check roof flashing and chimney flashing. A small gap there is a wide-open door for them.
Trim branches off the roofline and clear vegetation touching the siding.

If they're already gathering on the wall, sealing alone won't move them. That's when a perimeter treatment earns its keep.

What not to do when they're inside

Don't squish them. The yellow fluid stains and smells. Don't spray indoors for a few stragglers; you'll live with the chemical smell longer than you'd live with the beetles. Vacuuming works fine for the ones that are already in: vacuum them up and empty the canister outside.

But if you're vacuuming dozens, that's not a few stragglers. That's a gap somewhere, and treating the perimeter is the fix that actually lasts.

What the Fall Special covers

Through September 30 we're running our Fall Special, and it's built for exactly this situation: a full exterior perimeter treatment for Asian lady beetles and stink bugs, the two pests that show up together every fall, at 10% off with a 90-day warranty (standard is 60 days). Wasps and spiders are included at no extra cost.

One visit covers the zones where they actually gather: a foundation band, soffits and vents (their #1 entry point), attic access, plus overwintering wasp activity and spider webbing around the exterior. A one-time treatment starts around $225 with a 60-day warranty; the Fall Special saves you 10% and extends the warranty to 90 days, and it ends September 30. Details are on the Fall Special page.

We're family-owned, and there's no call center in between you and a schedule. Call (606) 385-2056 for our Ashland, KY line, (304) 521-1174 for Huntington, WV, or get your free estimate here. We also serve Ironton, OH and the surrounding tri-state communities.

FAQ

Are Asian lady beetles the same as ladybugs? No, they're related, but Asian lady beetles (Harmonia axyridis) are a different species. The fastest way to tell: Asian lady beetles have a white head with a black M-shaped mark; native ladybugs have a black head with white cheeks.

Do Asian lady beetles bite? They can give a light pinch when handled, and they release a yellowish fluid that can stain fabric. They don't damage your home and they don't infest food.

Why are they all over one side of my house? They're drawn to sun-warmed walls in late summer as they look for overwintering spots. The southwest side of a house is the classic gathering point.

Will they come back every year? If they've found a good overwintering spot, yes, and the numbers tend to grow. A perimeter treatment plus sealing the entry points breaks that cycle.

How much does Asian lady beetle treatment cost? A one-time treatment starts around $225 with a 60-day warranty. Through September 30, the Fall Special is 10% off with an extended 90-day warranty. Details are on our Fall Special page.