The wasps you will actually meet around a Tennessee house
Start with the nest, because color gets people nowhere. Almost everything here is some arrangement of yellow, brown, and black. An open comb hanging from a short stalk with the cells facing down is a paper wasp nest. You will find these under porch ceilings, carport beams, deck stairs, and shed rafters, and the colony usually stays modest through the season. They defend the comb but do not patrol far from it, and a nest at head height on a porch is a problem mostly because of where it is. A closed gray envelope with one hole near the bottom is a bald-faced hornet colony. Penn State reports the species across most of the contiguous states. These hang in trees and under eaves, and the wasps defend a radius around the nest rather than the nest surface alone. A hole in the ground with steady two-way traffic and no visible structure means yellowjackets, and that is the one that produces multiple stings at once. Finally, if the insect is very large, brownish, and flying after sunset, you are looking at a European hornet, which nests inside voids and hollow trees rather than in the open.
What a good first visit looks like
The first few minutes should be spent standing back and watching. Flight lines are what reveal the true entrance, and on a Tennessee house with wide soffits and a crawl space, the opening wasps use is frequently several feet from where somebody got stung. The application itself belongs at dusk or later. Foragers are back inside, the colony reacts slowly, and material placed at the entrance is carried through the nest by the wasps as they walk over it. Treating a full-sized colony at two in the afternoon mostly reaches whoever happened to be home and leaves the rest agitated. Before anyone packs up, you want four answers. How many days of continued traffic should you expect? When can the opening be sealed, and who does it? Is the nest itself coming down? What happens if wasps are still flying a week from now? Ask for a walk of the whole property while a ladder is already on site. A lot with a porch, a shed, a carport, and a tree line commonly has more than one active nest in September, and finding the second one now is cheaper than finding it in October.
Prevention for porches, decks, and crawl spaces
Tennessee houses hand wasps a lot of options, and the good news is that most of them can be closed in an afternoon. Flat sheltered undersides are where open combs start. Porch ceilings, carport beams, deck stair stringers, and the top edge of a storm door frame all qualify. Walk them with a flashlight every couple of weeks from early April, and knock down anything small. Because spring arrives early here, that walk should start sooner than most guides suggest. Cavities are the second category. Hollow deck railings, open pipe ends, unused downspouts, and pipe stubs get occupied by cavity-nesting wasps, and capping them removes the site for good. Void entries are the third and the most important. Crawl space vents, gable vents, worn soffit seams, and siding gaps are how yellowjackets and European hornets reach a wall cavity. Quarter-inch hardware cloth over the vents and caulk in the seams, done in cool weather, keeps the difficult nests from ever starting. Cleaning up fallen fruit and keeping trash lidded handles the late-season scavenging side.
Reading two quotes for the same nest
When two companies look at one Tennessee nest and give you numbers that are far apart, the explanation is almost always scope. Ask both the same short list of questions. What exactly is being treated, the wasps you can see or the void the colony occupies? Is the nest itself removed, and is that in the price? Who seals the entry point afterward, and is that a separate visit? What happens if wasps are still flying in a week, and does the return trip cost anything? How many nests did you find while walking the property? Those five answers usually account for the whole difference. A bid covering a void treatment, a follow-up, nest removal, and sealing is a different product from a bid covering an aerosol pointed at a soffit, even when both are described as wasp removal. Get it in writing, and be skeptical of a firm price quoted over the phone before anyone has seen where the nest actually is. On a hillside lot in East Tennessee, access alone can change the work involved more than the species does.
Deciding whether a nest is an emergency
The right test is who gets exposed, not how big the nest looks from the driveway. It is urgent when somebody on the property has had a systemic reaction to a sting. The American College of Allergy, Asthma and Immunology reports roughly a 60 percent chance of a similar or worse reaction on a later sting, and puts potentially life-threatening venom reactions at 0.4 to 0.8 percent of children and about 3 percent of adults. Adults are the higher-risk group, so a household without children does not get a pass. It is urgent when the nest sits at an entry door, a deck stair, a mailbox, or a play set, because those are places people move through without looking up. It is urgent when a ground nest is in a section that gets mowed. It is urgent when wasps start appearing indoors, which means the colony has a path through the wall. Everything else can be scheduled without worry. A gray envelope high in a tree at the back of a Tennessee lot, with nobody walking under it, is not a hazard and will be empty after cold weather arrives.