Three very different insects build nests on Texas houses, and homeowners tend to treat all three as the same emergency. They are not. One builds an open paper comb under an eave and defends it when disturbed. One nests underground in the yard and can reach a colony size that genuinely changes how you use the property. One builds mud tubes on a wall, stocks them with spiders and is almost never aggressive.
Telling them apart from the nest alone takes about ten seconds and changes what you should do next.
Paper wasps: the open comb under the eave
Paper wasps are three-quarters to an inch long, slender and narrow-waisted, with smoky black wings folded lengthwise at rest. Coloring varies by species, with Polistes exclamans brown with yellow markings and Polistes carolina, the one many Texans call a red wasp, reddish-brown overall (Texas A&M AgriLife Extension, Field Guide to Common Texas Insects: Paper Wasp).
The nest is the giveaway. AgriLife describes a single paper-like comb of hexagonal cells, oriented downward and suspended by a single filament, and makes the identifying point directly: paper wasp nests are open, and the cells are not covered with a cap or enclosed in an envelope. If you can see into the cells, you are looking at a paper wasp nest.
Size is worth knowing before you panic. A mature paper wasp nest may hold 20 to 30 adults, with nests containing up to 200 cells. AgriLife also notes the seasonal arc: in late summer the queen stops laying, the colony begins to decline, and in fall the mated female offspring leave to find overwintering sites in protected places such as cracks and crevices in structures or under tree bark. That is the reason wasps turn up inside a house in October when there is no nest anywhere nearby.
On the risk side, AgriLife is measured. Wasps attack when the nest is disturbed and each can sting repeatedly. Stings typically cause localized pain and swelling, but in sensitive individuals, or when many stings occur, whole-body effects can occur, including allergic reactions that may result in death. The same entry notes that males cannot sting at all, since the stinger is a modified egg-laying structure present only in females, and that paper wasps prey on caterpillars, flies and beetle larvae, which is why many gardeners count them as beneficial.
Yellowjackets: the one in the ground
Southern yellowjacket workers are about half an inch long, with clear wings and a black body marked in yellow on head, thorax and abdomen. The body is not hairy, which separates them from bees at a glance (Texas A&M AgriLife Extension, Field Guide to Common Texas Insects: Southern Yellowjackets).
The nest is built of chewed vegetable fiber forming a paper carton, and AgriLife notes these colonies occur in disturbed habitats such as yards and roadsides. Crucially, nests are most often underground, though they are occasionally found in wall voids and indoors. Where a nest is exposed or underground, it is spherical, made of round combs attached one below another and wrapped in a many-layered outer cover, which is the opposite of the open paper wasp comb.
Colony size is the reason yellowjackets get treated more seriously. AgriLife reports colonies containing up to 4,000 workers, and notes that in Texas and other southern states some colonies survive several years and keep growing, with reported nests six feet across. Workers forage for protein around picnic tables and garbage cans, which is the late-summer nuisance most people meet first. When a nest is disturbed, defending workers can inflict multiple stings.
The practical problem with an underground nest is that you often find it with a mower or a shovel rather than with your eyes. If you have seen a steady stream of yellowjackets entering and leaving one point in the lawn, a fence line or a slope, that point is worth marking and keeping people and pets away from until it is dealt with.
Mud daubers: the ones that look worse than they are
Adult mud daubers run three-quarters to an inch long and vary from dull black to black with bright yellow markings to iridescent blue-black. AgriLife gives the clearest identifying feature as the long, narrow waist, the petiole between thorax and abdomen (Texas A&M AgriLife Extension, Field Guide to Common Texas Insects, mud daubers entry).
These are solitary wasps. Nests are built and stocked by individual mated females rather than by a colony, which is why nobody defends them. AgriLife describes small mud nests built under overhangs such as building eaves, with the pipe organ mud dauber producing long parallel mud tubes and the black and yellow mud dauber building a rounded nest of one or several cells. Both provision their cells with paralyzed spiders. The iridescent blue mud dauber takes over nests built by the black and yellow species and stocks them mostly with black widow spiders.
On risk, AgriLife is clear: mud daubers and the related potter or mason wasps are solitary species, and although capable of stinging, they are rarely aggressive. Their nests are described as a nuisance in garages, under eaves and in other buildings. A mud nest on a wall is a cosmetic problem in almost every case, and knocking it down when it is not in use is usually the whole job.
Reading the nest, quickly
- Open honeycomb hanging from a single stalk, cells visible – paper wasp
- Enclosed papery ball, or heavy traffic in and out of a hole in the ground – yellowjacket
- Hardened mud, either parallel tubes or a rounded lump – mud dauber
- Steady traffic in and out of a gap in siding or a soffit, with no visible nest – a nest inside a void, which is the situation to take most seriously
Deciding whether a nest needs action at all
Location does most of the deciding. A paper wasp nest under a garden shed eave that nobody walks past is a different proposition from one over a back door, above a child’s play area, or beside a mailbox. The insects are the same; the chance of the nest being disturbed is not.
AgriLife does mention one homeowner option for paper wasps specifically: nests can be dislodged from eaves using sprays of high pressure water from a good distance, taking precautions not to allow wasps to attack nearby people or pets, and the wasps will eventually abandon the nest. Read the whole sentence before acting on it. The distance and the precautions are the operative parts, and this advice is for open paper wasp nests, not for yellowjackets and not for anything inside a wall.
Situations worth handing off rather than handling: an underground yellowjacket colony anywhere near where people walk, a nest inside a wall void or soffit, any nest at height, and any nest at all if someone in the household reacts badly to stings. Stinging insects are also not the only outdoor problem that makes a yard unusable in a Texas summer, and if the issue is evenings rather than nests, our mosquito control page covers that side of it. Fire ants raise a similar sting question from ground level and are covered on our ant activity page.
If activity around the house has moved past a single nest, the general warning signs are on our page about when a pest problem has outgrown a homeowner. Should you decide to bring someone in, ask them to confirm license status and insurance coverage, ask exactly which nest or nests are included in the scope, and ask what happens if a new nest appears at the same spot later in the season, because paper wasps reuse good locations. Homeowners in South and Central Texas see the longest wasp season in the state, and our San Antonio area page and Waco area page outline how matching works in those regions.
Checking what is available in your area
texaspestcontrolpro.com is a connection service. We do not perform pest control and we do not employ technicians. If you would like to be matched with participating providers based on your service area, you can use the request form on this page. Availability varies by area and by season, and you decide whether to move forward with anyone you speak to.
Leave a Reply