Stink bugs show up in homes across the UK, especially as the weather cools down. These shield-shaped pests sneak inside looking for warmth during autumn and winter. At Bath Pest Controllers, we’ve handled plenty of these invasions in Bath and nearby areas over the years. Homeowners often spot them clustering on walls, windowsills, or ceilings, and that distinctive smell when one gets disturbed makes the problem impossible to ignore.
The main culprit in the UK is the brown marmorated stink bug (BMSB), an invasive species that arrived here in recent years. It started showing up more frequently around 2021, and reports from places like the RHS and Natural History Museum confirm it’s spreading. These bugs don’t just annoy people indoors—they can damage crops outdoors, piercing fruits and veggies like apples, pears, peaches, tomatoes, and sweetcorn to suck out juices. That leaves behind rot spots and blemishes, which hurts gardens and farms.
We get calls about them regularly, so we put this guide together to answer the questions we hear most: how to get rid of stink bugs, do stink bugs bite, what do stink bugs eat, and more. We’ll cover identification, habits, prevention, and safe removal options. If the infestation gets out of hand, professional help makes a big difference.
What Do Stink Bugs Look Like and How to Identify Them
Adult stink bugs measure about 12-17mm long, with a distinctive shield-shaped body (that’s why some call them shield bugs). The brown marmorated type has a mottled brown-grey colour with pale dots along the edges, white bands on the antennae, and coppery or bluish patches on the head and pronotum. They stand out from native UK shield bugs because of that rectangular head and the rows of pale spots behind it.
Nymphs (young ones) look different—early stages are reddish-orange with black stripes, then they turn more off-white with red spots as they grow. They go through five instars before becoming adults.
Stink bug eggs are light green, oval or barrel-shaped, about 1.6mm long, and laid in tight clusters of 20-30 on the undersides of leaves. Females can lay hundreds over a lifetime, which is why populations build up fast if not caught early.
If you’re seeing these in your house, especially in clusters, it’s likely BMSB. They release that strong, coriander-like odour from scent glands when threatened or crushed—definitely not something you want lingering.
Do Stink Bugs Bite? Are Stink Bugs Dangerous?
A common worry we hear is “do stink bugs bite” or “can stink bugs bite humans?” The short answer: no, stink bugs do not bite people. Their mouthparts are built for piercing plant tissues to suck juices, not for going through human skin. Experts from places like Orkin, Terminix, and the EPA all confirm the brown marmorated stink bug isn’t aggressive toward humans or pets. They won’t sting or transmit diseases either.
At most, they might crawl on you if they land there, but that’s it. They’re not poisonous, and any rare irritation comes from the odour if you crush one near your skin. For families in Bath with kids or pets, this makes them more of a nuisance than a real health risk. Still, large numbers indoors can trigger allergies in sensitive people from the smell or debris.
Are stink bugs dangerous overall? Not to people directly, but they pose issues for agriculture by damaging crops. Indoors, they just make your home feel overrun.
What Do Stink Bugs Eat?
Stink bugs are plant feeders. They use piercing-sucking mouthparts to target fruits, vegetables, seeds, stems, and leaves. In summer, they go after apples, pears, peaches, berries, tomatoes, peppers, beans, corn, and soybeans. Feeding leaves discoloured spots, dents, or rot, which ruins the produce.
Outdoors in the UK, they hit gardens and farms hard. Indoors during winter, they don’t eat much—they’re in hibernation mode, surviving on fat reserves until spring.
This feeding habit explains why they become pests in homes near green spaces or orchards.
Can Stink Bugs Fly? Where Do Stink Bugs Come From?
Can stink bugs fly? Yes, adults fly well. They have fully developed wings folded over their back and can travel decent distances—some studies show flights up to 117km, though most stay under 5km. They fly toward lights or warmth, which draws them to houses in autumn.
Where do stink bugs come from? The brown marmorated stink bug is invasive, native to East Asia (China, Japan, Korea). It hit the US in the 1990s and reached the UK around 2021 via trade and shipping. They enter homes through tiny cracks around windows, doors, vents, soffits, pipes, or siding in search of overwintering spots. Once inside, they hide in attics, wall voids, or behind curtains until warmer weather.
In Bath and surrounding spots, we see more of them in properties near fields or gardens.
Stink Bugs in House: Signs and Why They Invade
You might notice them on south-facing walls (they like warmth), flying clumsily toward lights, or clustered in corners. That smell is a dead giveaway if one gets squished.
They invade homes in large numbers during fall to escape cold. They don’t breed indoors, but clusters can reach dozens or hundreds if entry points stay open.
How to Get Rid of Stink Bugs: Prevention and DIY Methods
Prevention beats dealing with them later. Seal cracks around windows, doors, vents, and foundations with caulk or weather stripping. Install tight-fitting screens and fix any tears. Keep outdoor lights off at night or use yellow bulbs—they attract fewer bugs.
Indoors, avoid crushing them (that smell lingers). Instead:
- Vacuum them up (empty the bag outside right away).
- Knock them into soapy water (they drown quickly).
- Use a container to catch ones on ceilings—they drop when disturbed.
Natural repellents work decently. Spray diluted peppermint or spearmint oil around windows and doors (5-10 drops per cup of water). Garlic powder spray (4 tsp in 2 cups water) or essential oils like clove or lemongrass can deter them too. Diatomaceous earth (food-grade) sprinkled along entry points dehydrates them.
For traps, a simple setup with a pan of soapy water under a light catches many indoors.
These steps handle small numbers, but bigger clusters need more.
Stink Bug Extermination: When to Call Professionals
For serious infestations, DIY only goes so far. We use targeted, low-impact treatments that focus on entry points and hiding spots without heavy chemicals. Our approach includes inspection, sealing, and safe removal—eco-friendly where possible, like our other services.
If you’re dealing with stink bugs in house right now, or worried about stink bug spray options, we can sort it fast. We also handle related pests—check our ant control or other insect control pages if you spot multiple issues.
Stink Bug Repellent and Long-Term Solutions
Beyond sprays, keep your home less inviting. Trim plants away from walls, clear debris outside, and reduce moisture. For gardens, remove weeds that host them early.
We recommend annual checks in autumn to seal up before they arrive. Our team offers ongoing maintenance for repeat problems.
Stink bugs are persistent, but with the right steps, you can keep them out. If they’re bugging you in Bath or nearby, reach out—we’re here to help get your place clear again.