Texas is home to at least half a dozen stink bug species, and if you’re finding them in your house or garden, you’re likely dealing with one of the most common: the southern green stink bug, the brown stink bug, or the conchuela stink bug. Most are plant feeders that become a nuisance in late summer and fall when they start looking for warm places to spend the winter. Here’s what you need to know about identifying them, protecting your plants, and keeping them out of your home.
Common Species in Texas
The southern green stink bug is one of the most widespread in the state. It’s bright green, shield-shaped, and about half an inch long. You’ll find it on tomatoes, beans, pecans, and a wide range of garden plants. The brown stink bug is similarly common and tends to show up in cotton and soybean fields before migrating into residential areas.
Other species you might encounter include the conchuela stink bug, the rice stink bug (a particular pest of grain crops along the Gulf Coast), and the harlequin bug, which is black with bright orange or red markings and has a strong preference for cabbage, broccoli, and other plants in the mustard family. There’s even a species called the rough stink bug that looks almost exactly like tree bark, making it nearly invisible on branches.
Not all stink bugs are pests. The spined soldier bug is a predator that eats caterpillars and other harmful insects. It looks similar to the brown stink bug but has pointed “shoulders” on its shell. If you spot one in your garden, leave it alone.
Why They Smell and Whether They’re Harmful
Stink bugs release their signature odor from glands on their underside when they feel threatened, which includes being stepped on, vacuumed up, or batted at by a curious pet. The smell comes primarily from a mix of long-chain aldehydes and esters, which is chemically different from skunk spray (that’s sulfur-based). The stink bug version is more of a sharp, cilantro-like or acrid chemical smell that lingers on skin and fabric.
Stink bugs don’t bite, sting, or transmit diseases to humans. If your dog or cat eats one, though, expect some drooling or mild vomiting. The defensive secretions irritate the mouth, tongue, and gums of pets, but there are no serious long-term health effects. Most pets learn to leave them alone after the first encounter.
When They Enter Homes
Stink bugs live comfortably outdoors through the Texas summer. The trouble starts in fall, typically from late September onward, when cooling temperatures trigger them to seek shelter. Their goal is to find a warm, protected spot to ride out winter in a dormant state. In Texas, where winters are milder than in northern states, this window can shift depending on when the first real cold front arrives. A sudden drop in temperature after a warm stretch is a classic trigger for mass home entry.
They squeeze through remarkably small gaps: cracks around window frames, gaps where utility pipes enter the wall, torn window screens, and the spaces behind vinyl siding. Once inside your walls, they go dormant. On warm winter days, some wake up early and wander into your living space, which is why you might find a stink bug on your curtain in January even though you sealed everything up months ago.
Keeping Them Out of Your House
Prevention is far more effective than dealing with stink bugs after they’ve settled into your walls. The key is sealing entry points before fall arrives.
- Caulk exterior cracks around windows, doors, fascia boards, and where pipes or wires enter the house. This works well on wood siding but is less effective on vinyl, which is designed to flex and leaves gaps that can’t be fully sealed.
- Seal interior openings if exterior sealing isn’t enough. Caulking around electrical outlets, switch plates, ceiling light fixtures, and heat ducts can keep bugs that are already in your walls from reaching your living space.
- Repair or replace damaged window screens and install door sweeps on exterior doors.
If stink bugs are already inside, vacuum them up or sweep them into a container. Avoid crushing them. Large numbers of squished stink bugs can leave brown stains on walls, carpet, and furniture. Their secretions wash off skin easily with soap and water, but fabric stains are harder to remove. A light trap (a simple desk lamp near a shallow pan of soapy water, set up in a dark room at night) can catch wandering bugs effectively.
Damage to Gardens and Crops
In the yard and garden, stink bugs do real damage. They feed by piercing plant tissue with needle-like mouthparts and sucking out fluids. On tomatoes, this creates pale, spongy spots under the skin called “cloudy spot.” On beans and peppers, you’ll see dimpled or deformed fruit. The feeding wounds also invite secondary infections from bacteria and fungi.
Pecans are a major target in Texas. Stink bug populations build through the summer on soybeans, sorghum, and weeds, then adults fly to pecan trees in late summer and fall. If they feed on developing nuts before the shells harden, the nuts drop off the tree entirely. Feeding after shell hardening produces dark, bitter spots on the kernel. Infestations peak from September through shuck split, which is the worst possible timing for the crop.
Controlling Stink Bugs in Your Garden
Adult stink bugs are tough. Their thick, shield-shaped exoskeleton makes them resistant even to strong insecticides, so chemical sprays are rarely a complete solution. A combination of physical and cultural methods works better for home gardeners.
Start by checking the undersides of leaves regularly for egg masses, which look like tight clusters of barrel-shaped eggs, often in neat rows. Crushing or scraping off egg masses before they hatch eliminates dozens of bugs at once. When you spot adults or nymphs, knock them into a bucket of soapy water. They tend to drop straight down when startled rather than fly, which makes this surprisingly effective.
Row covers placed over vegetable beds in spring create a physical barrier that keeps stink bugs off plants entirely, though you’ll need to remove them for pollination on fruiting crops. Kaolin clay sprayed on tomatoes coats the fruit with a fine mineral layer that deters feeding. It washes off at harvest.
Cultural practices matter too. Clean up plant debris at the end of the season, especially from beans, peas, and cabbage-family crops, which are favorite breeding sites. Thick organic mulch provides hiding spots for stink bugs, so consider switching to plastic or fabric mulch in problem areas. Tilling the soil in fall and early spring disrupts overwintering sites. If you use insecticides, choose short-residual options like insecticidal soap or neem oil, and target young nymphs rather than adults. These products barely affect mature stink bugs but can reduce populations when applied to early-stage nymphs. Using selective products also preserves the natural predators and parasitic wasps that help keep stink bug numbers in check.