Seed Bug Or Stink Bug?
| Western Conifer Seed Bug | Brown Marmorated Stink Bug | |
|---|---|---|
| Shape | Long and narrow | Wide, shield-shaped |
| Back legs | Leaf-like flaps | Plain, no flaps |
| Markings | Pale zigzag across the back | Light bands on the antennae and along the body's edges |
| Outdoor food | Conifer seeds and cones | Many fruits, vegetables and trees |
Both are overwintering invaders, and the same steps keep them out. Our guide on keeping stink bugs out before a cold snap covers timing in more detail.
If a large brown bug has been crawling up your window or buzzing around a lamp this fall, it may be a western conifer seed bug. Around your Paramus home, these insects tend to show up as the weather cools, looking for a warm, protected place to spend the winter. They're big, they buzz loudly when they fly and they can smell when handled, so they get people's attention. The short answer is that you don't need to be worried. They're a nuisance, not a threat. Below, we'll cover how to identify them, why they come inside and how home pest-proofing helps keep them out.
What Western Conifer Seed Bugs Are
The western conifer seed bug is a native North American insect that started out in the West and has spread across much of the country, including the Northeast. It belongs to the leaf-footed bug family, named for the flattened, leaf-like flaps on the back legs.
- Size. About three-quarters of an inch long.
- Color. Reddish brown to dull brown, with a thin, pale zigzag line across the middle of the back.
- Legs. Back legs with a flat, leaf-shaped widening near the middle.
- In flight. They make a loud buzzing sound and flash yellow-orange markings on the abdomen.
Outdoors, they feed on the developing seeds and cones of pines and other conifers. In fall, adults leave the trees in search of shelter, which is when they start showing up on siding, windows and doors.
Why They Come Inside
Like stink bugs and boxelder bugs, western conifer seed bugs spend the winter as adults. In the wild, they hide under bark or in leaf litter. Homes offer something even better: dry, protected spaces inside walls, attics and window frames. They crawl in through:
- Gaps around window and door frames.
- Cracks in siding, trim and soffits.
- Openings where pipes, wires and vents enter the house.
- Torn screens and unscreened attic or soffit vents.
Once inside a wall, some wander into living areas on warm days in winter and early spring, when they mistake indoor warmth for the change of seasons. South- and west-facing walls warm up most in the afternoon sun, so those sides of the house often see the most activity in fall.
Should You Be Worried?
Not really. Western conifer seed bugs:
- Don't bite people or pets.
- Don't sting.
- Don't carry disease.
- Don't breed or lay eggs indoors.
- Don't eat wood, fabric, food or houseplants.
The downsides are the noise, the surprise of finding one and the smell. When handled or crushed, they can release an odor that some people compare to pine or a sharp chemical scent. That's their main defense.
What To Do If They're Already Inside
Finding a few seed bugs in late fall or on a sunny winter day is normal once they've settled into your walls. Here's how to handle them without making things worse:
- Pick them up gently. Use a tissue or a jar and release them outside, or drop them in a cup of soapy water.
- Vacuum larger numbers. A hand vacuum works well on windowsills and ceilings. Empty it outdoors right away so the odor doesn't linger.
- Skip bug bombs. Foggers don't reach insects hidden inside walls, and they leave residue on surfaces in your living space.
- Check where they appear. Bugs that keep showing up in the same room often point to a nearby gap around a window, outlet, light fixture or attic hatch.
Because they don't reproduce indoors, the number you see won't grow over the winter. The goal is to remove the ones that wander out and to block the gaps before next fall.
How To Keep Them Out
- Seal gaps before fall. Caulk cracks around windows, doors, trim and siding, and seal openings around pipes and wires.
- Repair screens. Fix torn window and door screens and check that attic and soffit vents are screened.
- Install door sweeps. Close gaps under exterior doors.
- Vacuum, don't squish. Vacuum bugs you find indoors, then empty the bag or canister outside.
- Avoid sealing them in. If bugs are already in your walls, they'll come out on their own in spring. Sealing interior gaps keeps them from wandering into rooms.
When To Call A Professional
If you're seeing a steady stream of overwintering bugs every fall, it's worth having the outside of your home checked. Our NJ DEP-licensed technicians inspect for entry points, seal gaps where insects get in and recommend a plan using Integrated Pest Management and EPA-registered, eco-safe products. We offer free inspections and same-day or next-day service.
Western conifer seed bugs look and sound alarming, but they're harmless houseguests. A little sealing before fall goes a long way toward keeping them outside your Paramus home.