Why Bugs Are Suddenly All Over Your House This Fall (And What to Do About It)

If you've noticed bugs clustered on the sunny side of your house, crawling across your windows, or turning up in a lamp shade, you're not alone. Every fall, our phones at GPM Termite and Pest Solutions start ringing with the same question: "Where did all these bugs come from?"

The answer is the weather. Right now across Southeast Tennessee and North Georgia, we're getting the classic fall pattern of chilly nights followed by warm, sunny afternoons. That swing in temperature is the signal a group of insects called occasional invaders have been waiting for.

What Are Occasional Invaders?

Occasional invaders are insects that live outdoors most of the year but move into homes and buildings when the seasons change. They aren't trying to eat your food or build a nest in your kitchen. They're simply looking for a protected place to spend the winter.

In the wild, these bugs would ride out winter under tree bark, in leaf litter, or in rock crevices. But to them, your home is a giant, warm rock with plenty of cracks. Gaps around windows, siding, soffits, and utility lines are the perfect way in.

Here in the Chattanooga area, four occasional invaders show up more than any others this time of year.

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1. Boxelder Bugs

Boxelder bugs are about half an inch long, black, with bright red or orange lines on their backs. They feed on the seeds of boxelder, maple, and ash trees. In the fall, they gather by the hundreds on south- and west-facing walls to soak up the afternoon sun before slipping inside.

2. Asian Lady Beetles

They look like ladybugs, but Asian lady beetles behave very differently. They swarm sunny, light-colored walls in the fall, find their way into attics and wall voids, and can give off a yellowish fluid that smells bad and stains. Some people even get nipped by them.

3. Stink Bugs

The brown marmorated stink bug is the shield-shaped, mottled brown bug you've probably found on your curtains. True to its name, it releases a strong odor when disturbed or crushed. Stink bugs slip into attics and walls in large numbers and often reappear on warm winter days.

4. Kudzu Bugs

If you live anywhere near kudzu (and in the Tennessee Valley, who doesn't?), you may have met the kudzu bug. These small, olive-brown, roundish bugs are about a quarter inch long. They leave their kudzu patches in the fall and gather on light-colored homes, cars, and siding. They can stink, stain, and irritate skin.

Why the Cool Night, Warm Day Pattern Matters

These insects are cold-blooded, so their activity follows the temperature. Cool nights tell them winter is coming. Warm afternoons give them the energy to fly and crawl looking for shelter. That's why you'll often see the biggest crowds on the sunny side of your home in the mid-to-late afternoon.

Once they find a good spot, some of them release scents that attract others of their kind. That's why the same homes tend to get hit year after year.

Are Occasional Invaders Dangerous?

For the most part, no. Boxelder bugs, lady beetles, stink bugs, and kudzu bugs don't spread disease, don't damage wood, and won't breed inside your home over the winter. But they are a real nuisance. They can stain walls and fabrics, leave unpleasant odors, trigger allergies in some people, and show up by the dozens just when you thought they were gone.

What You Can Do Right Now

• Don't squash them. Crushing stink bugs, lady beetles, and kudzu bugs releases odors and stains. Use a vacuum instead, and empty it outside right away.
• Seal up gaps. Caulk cracks around windows, doors, and trim. Check weatherstripping and door sweeps.
• Repair screens. Look at window, attic, and soffit vent screens for tears.
• Seal utility openings. Gaps where cables, pipes, and dryer vents enter the house are common entry points.
• Watch your lights. Some of these insects are drawn to light, so close blinds in the evening near problem areas.
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How GPM Can Help

The best defense against occasional invaders is stopping them on the outside of your home before they ever get in. That's where our Exterior Perimeter Control and monthly pest control service make a difference.

Most companies treat quarterly. At GPM, we come out every month, so your home stays protected as the seasons change and new pests start moving. As a family-owned company serving Chattanooga and North Georgia since 2006, we know exactly when these bugs show up and where they like to get in.

If boxelder bugs, lady beetles, stink bugs, or kudzu bugs are taking over your walls and windows, call us at 423-517-7378 or request a quote online. And be sure to check out our special deal for new customers.

Over the next few weeks, we'll take a closer look at each of these fall invaders. Follow us on Facebook, Instagram, and X so you don't miss it.