Louisiana is home to several stink bug species, including both plant-feeding pests that damage crops and gardens and predatory species that actually help control other insects. The most widespread pest species in the state is the brown marmorated stink bug, an invasive insect from East Asia that has spread across much of the United States. But Louisiana’s warm, humid climate also supports native species like the green stink bug and the southern green stink bug, which feed on tomatoes, soybeans, pecans, and citrus.
Common Species in Louisiana
The brown marmorated stink bug is the one most people encounter indoors. It’s roughly the size of a dime, shield-shaped, and mottled brown with lighter bands on its antennae and along the edges of its abdomen. It feeds on a wide range of fruits and vegetables, puncturing the skin and leaving dimpled, discolored spots on the flesh beneath.
The green stink bug and southern green stink bug are bright green, slightly larger, and tend to stay outdoors. They’re serious agricultural pests in Louisiana, particularly in soybean and rice fields, where they pierce developing seeds and reduce yields. Home gardeners often find them on tomatoes, peppers, and beans.
Not every stink bug you see is a problem. The spined soldier bug is a predatory species that feeds on caterpillars, beetle larvae, and other soft-bodied insects. You can tell it apart from pest species by its sharply pointed “shoulders,” the pronounced spines on the front edges of the plate behind its head. Its mouthparts also extend forward when feeding, whereas plant-feeding stink bugs point their mouthparts downward. If you spot one in your garden, it’s working in your favor.
Why They Enter Homes
Stink bugs don’t breed indoors or cause structural damage. They enter homes in fall looking for a sheltered spot to spend the winter, a behavior called overwintering. Louisiana’s mild winters mean the invasion season can start later and last longer than in northern states, but the pattern is the same: as temperatures drop and daylight shortens, stink bugs seek cracks and gaps on the sunny sides of buildings and work their way inside walls, attics, and living spaces.
Once inside, they typically settle into gaps behind baseboards, around window and door trim, and near exhaust fans or ceiling lights. On warm winter days, they sometimes emerge and congregate on windows or walls, which is when most people notice them. They aren’t feeding, breeding, or doing anything destructive. They’re just waiting for spring.
Keeping Them Out of Your Home
Mechanical exclusion is the single most effective strategy. That means physically sealing the gaps stink bugs use to get inside before fall arrives. Focus on these entry points:
- Windows and doors: Seal cracks around frames with silicone or silicone-latex caulk. Repair or replace damaged screens.
- Utility penetrations: Close gaps around pipes, wires, and conduits where they pass through exterior walls.
- Siding and fascia: Seal openings behind wood fascia boards and where different siding materials meet.
- Chimneys and vents: Check behind chimneys and around attic vents for unsealed gaps.
This work pays off beyond stink bugs. The same gaps let in moisture, drafts, and other insects. In Louisiana, where humidity drives so many home maintenance challenges, sealing your building envelope is always worth the effort.
Removing Stink Bugs Already Inside
The key rule is simple: don’t crush them. Stink bugs release a strong, unpleasant odor when threatened or squashed, and the smell lingers on skin, fabric, and surfaces.
The easiest hands-off method is a container of soapy water. Slide the container up a wall or window where a bug is resting and let it drop in. The soap breaks the surface tension so the bug can’t escape, and it drowns without releasing much scent. For larger numbers, a vacuum works well. Use a shop vac or standard vacuum, but expect the canister or bag to smell for a while afterward. A useful trick: slip a knee-high stocking over the outside of the vacuum tube and push it slightly inside, then secure it with a rubber band. The stocking catches the bugs before they reach the canister. Turn off the vacuum, pull the stocking out, and dump the contents into soapy water.
Pesticide sprays inside the home are generally not worth it. They don’t prevent more bugs from emerging from wall voids, and dead stink bugs in hard-to-reach spaces can attract carpet beetles and other scavengers.
Risks to People and Pets
Stink bugs don’t bite, sting, or transmit diseases. They aren’t poisonous. The main concern is their defensive secretion, which can cause mild skin or eye irritation if you handle them roughly. Wash your hands after contact and you’ll be fine.
Pets, especially dogs, sometimes eat or chew on stink bugs. The secretions irritate the mouth and digestive tract, which can cause drooling, lip-smacking, or vomiting. These symptoms are temporary and resolve on their own. There don’t appear to be serious or long-term health effects from a pet eating a stink bug, though repeated episodes of vomiting are worth mentioning to your vet.
Garden and Crop Damage
In Louisiana gardens, stink bugs feed by piercing plant tissue with needle-like mouthparts and sucking out fluids. On tomatoes, this leaves pale, cloudy spots just under the skin. On peppers and beans, you’ll see dimpled or deformed areas. On pecans, feeding during the early season causes nuts to drop prematurely, while late-season feeding creates dark, bitter spots in the kernel.
For home gardens, hand-picking into soapy water is practical for small infestations. Row covers can protect vulnerable crops during peak feeding periods. Keeping the garden free of weeds and debris reduces shelter for overwintering adults. In larger agricultural settings, Louisiana growers often use threshold-based scouting, only treating fields when bug counts reach levels that justify intervention, to preserve populations of beneficial predators like the spined soldier bug that help keep pest numbers in check naturally.