The Stink Bug Problem in Westchester County
Every September and October, Westchester County homeowners start noticing the same unwelcome visitor: the brown marmorated stink bug (BMSB). These shield-shaped insects — roughly the size of a dime, brown and mottled with banded antennae — are not a native pest. They arrived from eastern Asia in the late 1990s and have since spread across the entire northeastern United States. Westchester County, with its mix of suburban neighborhoods, older housing stock, and abundant fruit trees and gardens, provides ideal habitat and easy entry points for stink bug overwintering.
And if you crush one? You'll understand immediately how they got their name.
Why Stink Bugs Invade Westchester Homes
Stink bugs are outdoor pests for most of the year, feeding on fruit, vegetables, and ornamental plants throughout spring and summer. But when temperatures drop in late September and October, they instinctively seek protected overwintering sites — and your home is exactly what they're looking for.
Westchester's housing stock is particularly vulnerable. The stone-and-wood-frame homes common in Bedford, Katonah, Scarsdale, and Harrison tend to have aged caulking around window frames, gaps in siding where it meets trim, and older attic ventilation screens that leave openings large enough for stink bugs to exploit. South-facing walls that absorb heat during the day act as beacons, drawing congregating stink bugs toward the warmest surfaces of your home.
Once inside, stink bugs move into wall voids, attics, crawl spaces, and the areas behind window casings. They enter a semi-dormant state and wait out the winter. The problem restarts in March, when warming temperatures cause them to become active again — and many find their way into living spaces, buzzing clumsily toward windows and light fixtures.
Where to Find Them
If you're seeing stink bugs indoors, they're likely coming from several key locations:
- Attics and attic vents: Unsealed or screened-only vents are common entry points.
- Window and door frames: Gaps in caulking, especially on south and west-facing exposures.
- Behind wall outlets and switch plates: These gaps connect directly to wall voids.
- Ceiling light fixtures: Particularly in rooms below attic spaces.
- Sliding doors and screen door frames: Especially when seals are worn.
What NOT to Do
Before discussing solutions, let's address the most common mistakes Westchester homeowners make:
Don't crush them. Crushing releases the pungent chemical they're named for. More importantly, it may trigger other stink bugs in the area to release their own defensive chemicals — a feedback loop that makes the situation worse.
Don't vacuum them with your household vacuum. Unless you have a dedicated shop vac you don't care about, the smell will linger in the machine and spread every time you vacuum afterward.
Don't use fogger bombs. Foggers don't penetrate wall voids and attic spaces where stink bugs congregate. They'll just scatter the ones in open areas, many of which will retreat deeper into the structure.
Don't seal them inside walls. If you've already had an invasion and stink bugs are overwintering in your walls, sealing exterior gaps in midwinter traps them inside. They'll either die and attract secondary pests or emerge into living areas in spring. Timing matters.
The Right Approach: Exclusion + Professional Perimeter Treatment
The most effective defense against stink bugs is a two-part strategy: physical exclusion done before the invasion, and targeted perimeter treatment applied in early fall.
Exclusion (do in August–early September):
- Caulk all gaps around window frames, door frames, and trim
- Install door sweeps on exterior doors
- Replace or repair damaged attic vent screens with fine mesh
- Seal utility penetrations (pipes, wires entering the foundation)
- Check crawl space vents for gaps
Professional exterior perimeter treatment (late September/early October):
A licensed pest control technician applies residual insecticide to south-facing exterior walls, eaves, window frames, and potential entry points. This creates a treated zone that kills stink bugs before they enter. The timing is critical — treatment needs to be in place before the mass migration begins. Once they're inside, exterior treatment has limited effect.
If They're Already Inside
If stink bugs are already overwintering in your home, the best short-term approach is to collect them carefully using a sealed container or plastic bag and dispose of them outdoors. A handheld vacuum with a bag you can immediately dispose of also works.
For heavier infestations, Hello Pest Control can perform interior treatment targeting the voids and spaces where stink bugs are congregating, as well as an exterior barrier to prevent additional entry.
Serving Westchester's Stink Bug Season
Hello Pest Control provides professional stink bug perimeter treatment for homeowners throughout Westchester County, including Scarsdale, Harrison, Katonah, Bedford, White Plains, Tarrytown, and Larchmont. Exterior perimeter treatment is priced at $250–$400 depending on home size and scope.
The window to act preventively is late summer and early fall. If you missed it this year and are already dealing with stink bugs inside, call us for an inspection and treatment plan. Reach Hello Pest Control at (888) 973-7839.
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