As temperatures cool in Indianapolis, Asian lady beetles, stink bugs, and boxelder bugs often move toward homes in search of warmth. While these fall invaders are mostly harmless, they can become a frustrating indoor nuisance. Learn how to identify them, prevent them from getting inside, and know when it may be time to call Maven Pest Control for help.
On a warm October afternoon, the sunny side of your house is suddenly covered in little bugs. A day later, a few are inside, bumping around a window. It is one of the most common calls we get once the weather turns, and the good news is that these guests are more of a nuisance than a threat. Here is how to tell who is who, and how to keep your Indianapolis home protected.
WHY THEY SHOW UP
As Indiana nights get colder, insects look for a warm place to wait out winter. They drift toward the sun-warmed walls on the south and west sides of your home, then slip through gaps around windows, doors, siding, and the foundation.
Purdue Extension notes that Asian lady beetles show up first on southwest-facing walls of light-colored buildings near woods, which describes a lot of Indianapolis. Once inside, they settle into wall voids or attic corners until late winter.
KNOW THE SUSPECTS
This is the one people mistake for a ladybug. The color runs from yellow to orange to deep red, and the spots vary, so color alone can’t tell you much. The reliable tell is a small black "M" behind the head.
Native ladybugs are a steady red and stay outdoors eating aphids, while Asian lady beetles pile up on your siding and work their way inside. Press on one, and it can release a yellow, smelly fluid that stains.
Stink bugs are easy to spot once you know the shape: shield-shaped and mottled brown, about the size of a fingernail. They do not damage your home, but they earn the name if you crush them, so sweep or vacuum them out instead. Indiana’s DNR has more on the brown marmorated stink bug.
Boxelder bugs are about half an inch long, black with red-orange lines, and their wings cross into an "X." They don’t really bite, and they don’t breed indoors. That last part matters: every boxelder bug you spot inside came in from outside, which is why sealing the house does more than any indoor spray. Purdue Extension covers them in its boxelder bug publication.
Here is a quick side-by-side to help you identify these falltime insects:
Bug
How to spot it
What it does indoors
Asian lady beetle
Orange to red, with a small black "M" behind the head.
Gathers in large clusters and leaves a yellow stain and a foul smell if you press on it.
Brown marmorated stink bug
Shield-shaped and mottled brown, about the size of a fingernail.
Harmless, but gives off a strong odor when crushed or handled.
Boxelder bug
Half an inch long, black with red-orange lines, wings crossed in an "X".
Does not breed inside and can stain surfaces.
THE GOOD NEWS
It helps to know what these bugs will not do. None of the three spread disease or chew through your home, and none of them reproduce indoors or touch your food. They can stain a wall or leave an odor if handled roughly, and in big numbers they are frustrating, but they are not dangerous to your family or your house.
KEEP THEM OUT
The most effective approach is to close the door before they arrive:
Timing is crucial. Late summer and early fall is when a treatment around the outside of the home does the most good. That is why a plan timed to Indiana’s seasons beats a one-off spray mid-invasion.
WHEN TO CALL
If the insect clusters keep coming back, and you would rather not spend October searching your home’s exterior, caulk gun in hand, Maven Pest Control in Indianapolis is here to help.
At Maven, we don’t just spray and leave. We start with a complimentary inspection, build a plan around your home and the season, and set up ongoing protection. Our technicians are licensed, trained, and background-checked, and we never push products you do not need. If pests return between visits, we come back at no extra charge.
GET YOUR QUOTE
You don’t have to share your home with this season’s uninvited guests. Get a free, no-obligation quote from Maven Pest Control Indianapolis, or call (317) 401-9934. We’ll treat your home like it’s our own.
COMMON QUESTIONS
Not in any lasting way. They don’t damage your home, eat your food, or spread disease. They can leave a yellow stain and an odor if crushed, and on warm days a few may land and pinch, though they will not break your skin.
Indoor sprays only reach bugs out in the open, and most of these insects are tucked into wall voids where sprays cannot reach them. So a spray might kill a few stragglers in the open, but it leaves you sweeping up dead beetles while the ones hidden in your walls keep trickling indoors for weeks. Sealing the entry points and vacuuming up strays is more reliable.
Check right behind the head. A small black "M" means it is an Asian lady beetle, the kind that clusters on siding and slips indoors in the fall. A steady red body with no "M," out in the garden rather than on your window, is more likely a native ladybug you can leave alone.