As the cooler months begin to roll in across New England, many homeowners notice a sudden influx of fall invaders—stink bugs, ladybugs, and conifer seed bugs. These pests are known as “overwintering insects,” which means they look for a safe, warm place to ride out the cold season. Unfortunately, that often means your home.
While they’re not harmful to people, pets, or your property, they can become a nuisance if they gather in large numbers. Since Cornerstone Pest Control does not offer specific treatments for these pests, the best approach is prevention. By taking a few proactive steps, you can keep them out and minimize their presence indoors.
Meet the Fall Invaders
Stink Bug
Stink Bugs
Brown marmorated stink bugs are shield-shaped insects that release an unpleasant odor when disturbed or crushed. They are primarily agricultural pests, but once the weather cools, they flock to homes to hibernate.
Ladybugs (Asian Lady Beetles)
Although many people consider ladybugs a sign of good luck, the species that invades homes in New England is usually the Asian lady beetle. Unlike their harmless cousins in the garden, these beetles often enter houses in large numbers, leaving stains and odors behind.
Conifer Seed Bugs
These long, leaf-legged bugs are often mistaken for stink bugs, but they don’t produce the same strong odor. They feed on the seeds of pine and other conifers outdoors but, like the others, become household invaders in fall.
Why They Come Indoors
Ladybug
As temperatures drop, these insects seek warmth and shelter. Homes provide the perfect environment—protected, dry, and full of small cracks and crevices where they can squeeze in. They typically hide in attics, wall voids, or around windows and doors, remaining dormant until spring, when they try to exit.
Preventative Measures for Homeowners
Because these pests are difficult to eliminate once they’re inside, the best defense is prevention. Here’s what homeowners can do to reduce their chances of an infestation:
- Seal Entry Points
Carefully inspect your home for gaps, cracks, or holes around:
- Windows and doors
- Siding and trim
- Attic vents
- Utility penetrations (wires, pipes, dryer vents)
Use caulking or weatherstripping to seal gaps and replace worn door sweeps. Even small openings can provide an entryway for dozens of bugs.
- Install Screens
Check that all window and door screens are intact and fit snugly. Consider adding mesh screens to attic vents and chimneys to block insects while still allowing airflow.
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Conifer Seed Bug
Reduce Outdoor Attractants
These pests often congregate on sunny sides of houses in fall. Minimize outdoor lighting at night, which can attract them, and keep firewood or debris piles away from the foundation.
- Vacuum, Don’t Squash
If a few do make it inside, resist the urge to crush them—especially stink bugs, which release their characteristic odor. Instead, use a vacuum to collect them, then promptly dispose of the vacuum bag.
- Consider Seasonal Timing
The invasion usually peaks in late September through October. Taking preventative measures in late summer or early fall can significantly reduce the number of bugs that make it indoors.
What Not to Expect
It’s important to note that professional pest control treatments are generally not effective for stink bugs, lady beetles, or conifer seed bugs once they’ve entered your home. Since they overwinter in hidden areas, surface treatments rarely reach them. The most reliable solution for fall invaders is prevention before they find their way inside.
Living with Overwintering Pests
While annoying, these insects are not destructive like termites, rodents, or carpenter ants. They don’t eat wood, damage your belongings, or bite. Most will stay hidden until spring, when they try to find their way back outdoors. With good sealing, regular maintenance, and smart prevention, you can make your home far less inviting. For additional pest control articles, check out our blog!