A wasp nest under the eaves or in a shrub is a common discovery in North Houston yards, especially from late spring through fall when colonies are at peak size. Most people's instinct is to knock it down or spray it with whatever is under the sink. Both usually make things worse. The right response depends on the nest type, its location, and the size of the colony, and knowing the difference keeps you from getting stung.
Quick answer
Small paper wasp nests under eaves with fewer than 20 cells can often be treated at night with a pressurized wasp spray from a safe distance. Larger nests, ground-nesting yellow jackets, bald-faced hornet nests, and any nest near a door or HVAC intake are situations where professional removal is the right call. Never knock down an active nest without treating it first.
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Identifying What You Have
Paper wasps build open, umbrella-shaped combs under eaves, in shrubs, inside grills, and in covered outdoor furniture. The comb cells are visible and uncovered. Texas has several paper wasp species, and they are the most common wasp you will encounter on a residential property in the Kingwood area. Colonies typically max out at around 30 to 40 workers by late summer.
Yellow jackets nest in the ground, in wall voids, or in dense shrubs. They are shorter and stockier than paper wasps, with brighter yellow-and-black banding. Ground-nesting yellow jacket colonies can hold thousands of workers and are highly defensive. Stepping near the entrance or running a lawn mower over it triggers mass stinging. Bald-faced hornets, which are actually a yellow jacket species, build large gray paper nests in trees or on structures that can house several hundred workers.
What Not to Do
Knocking a nest down without chemical treatment first displaces the colony without killing it. The wasps will rebuild nearby and are now agitated. This is the single most common mistake. Do not try to smoke wasps the way you would bees: wasps do not respond to smoke the same way and it does not calm them.
Spraying with a general-purpose bug spray from a short distance is unlikely to have enough knockdown power and puts you close to the nest. If the spray does not reach the nest directly, you have alerted the colony without doing any damage. Do not seal a ground-nesting yellow jacket entrance hole without treating it first: the colony will find or chew a new exit, sometimes into a living space.
When DIY Treatment Is Reasonable
A small, early-season paper wasp nest with fewer than 20 cells and located away from foot traffic is a reasonable DIY target. The approach: treat at night or just before dawn when workers are inside and less active. Use a pressurized wasp and hornet spray that shoots at least 20 feet, aim at the nest base, soak it thoroughly, then move back. Wait at least 24 hours before removing the nest. Do this during cooler evening temperatures, not midday heat, when wasps are more agitated.
- Treat at night or near dawn when activity is lowest
- Use a pressurized spray that reaches at least 20 feet
- Soak the nest base where wasps enter
- Wait 24 hours and check for activity before removing
- Wear long sleeves, gloves, and eye protection even for small nests
When to Call a Professional
Ground-nesting yellow jackets, large bald-faced hornet nests, nests inside wall voids or attics, and any nest within five feet of an entry point are situations where DIY removal carries real risk. Wall-void nests are especially tricky because treatment must reach the interior of the void or the colony will survive and potentially push deeper into the wall. If anyone in the household has a known venom allergy, professional removal is always the right call, regardless of nest size.
A professional treatment kills the colony before anything is moved. With yellow jackets in a wall void, that also includes monitoring to ensure the dead colony does not attract secondary pests drawn to the honeycomb or carcasses inside.