Formosan subterranean termites have been found in several homes clustered in one Wylie neighborhood in Collin County, and the species is confirmed in about 30 eastern Texas counties, including Collin and Dallas. Native eastern subterranean termites remain the everyday North Texas termite, but Formosans are harder to control and worth knowing about.
Key takeaways
- A pest-control company reported finding Formosan termites in several homes clustered in one Wylie neighborhood in Collin County; that is a local find, not evidence that they are in every Plano street.
- Formosans are confirmed in about 30 eastern Texas counties, including Collin and Dallas, and were probably brought to the Dallas-Fort Worth area in railroad ties used for backyard walls and landscape borders.
- Native eastern subterranean termites are still the common termite across North Texas, and the two species look similar enough that a technician or an entomology lab usually needs to confirm which one you have.
- Formosan colonies are generally described as larger and more aggressive than native colonies, which is why an early inspection matters more than guessing from a few wings on a windowsill.
- Landscape timbers and railroad ties touching soil are worth inspecting; wood-to-soil contact helps any subterranean termite, and it is the item homeowners can change most easily.
What are Formosan termites and where have they been found in Collin County?
Formosan subterranean termites are an invasive species originally from East Asia. In Collin County, a pest-control company found them in several homes clustered in one Wylie neighborhood. The species is confirmed in about 30 eastern Texas counties, including Collin and Dallas, and has been reported in Aledo, Grapevine, Flower Mound and Rockwall.
The Formosan subterranean termite is a non-native species that was first reported in Houston in 1956. In most of the United States it is tied to warm, humid climates, which is why it is much better known along the Gulf Coast than in North Texas. Its arrival here is mostly a story about moving wood rather than moving weather.
The best-documented Collin County find is a trade-press report of several homes clustered in a single Wylie neighborhood. Clustering is the important detail: it suggests a colony or colonies spreading between neighboring properties rather than random infestations in unrelated houses. The report is undated in the sources we reviewed, and we do not know how the neighborhood was treated or how the situation has changed since.
Since the 1990s, Formosans have also been reported in Aledo, Grapevine, Flower Mound and Rockwall. That list gives the species an arc around Dallas-Fort Worth rather than a single point. It does not mean that Plano homes have Formosan termites, and we are not claiming they do. It means the species is in the region, and a homeowner is right to ask the question when a technician finds termites.
Formosans are rarely found north of 35 degrees north latitude, and Plano is at about 33 degrees north. That is a general statement about the species' range, not a guarantee about any one lot. The honest summary is that the species is present in Collin County, uncommon compared with native termites, and not something to dismiss.
How did Formosan termites get to North Texas?
Formosan termites were probably brought to the Dallas-Fort Worth area in railroad ties that were reused for backyard retaining walls and landscape borders. Because the insects live inside wood, they can survive transport. That explanation is a leading theory rather than proven for each find, but it shapes how timbers around a yard are treated.
Railroad ties were used for decades as cheap, rot-resistant landscape timber. A tie that had been sitting in a rail yard near a Gulf Coast port could have carried a small colony when it was cut up, trucked north and stacked as a flowerbed border in a new subdivision. A colony needs only moisture, wood and soil contact to take hold.
This is why pest-control professionals often ask about landscaping when they find Formosans. A garden wall built from old ties, a stack of firewood against a fence or a wooden planter sitting directly on soil are all places where termites can begin. If a house has an older timber border within a few feet of the slab, it is worth pointing out at the start of any termite inspection.
None of this means railroad ties are the cause of every case. Termite swarms can fly short distances, and a colony in a neighboring yard can spread. The theory simply points to a practical rule: any wood that sits in the soil near a house is a reason to look closely.
How are Formosan termites different from native termites?
Formosan colonies are generally larger and more aggressive than native eastern subterranean termite colonies, they can build above-ground nests when moisture is available, and their swarmers often fly in the evening. The two species look similar, so confirmation by a technician is needed instead of a guess from appearance alone.
Native eastern subterranean termites are the everyday North Texas termite. They live in soil and build mud tubes to reach wood, and a typical colony is smaller than a Formosan one. Because the soil here is Blackland clay that holds moisture and cracks in drought, the native termite already has plenty of routes into homes.
Formosans differ in several ways that matter for treatment. The comparison below is a general summary, and individual colonies vary. Because the visible differences are subtle, swarmers and workers are normally identified by a technician or under magnification, which is why a sample in a sealed container is more useful than a photo.
| Feature | Native eastern subterranean | Formosan subterranean |
|---|---|---|
| Status in North Texas | Native, the everyday termite | Introduced, found in Collin and Dallas counties among about 30 eastern Texas counties |
| Colony size | Generally smaller | Generally much larger, which means more wood eaten in less time |
| Nest location | Mainly in the soil | Soil, but can also build above-ground nests where moisture is trapped |
| Swarm timing | Often late winter to spring after rain | Often a later, evening swarm; timing is less well documented here |
| Control approach | Soil treatment or baits | Same tools, but colonies can be harder to eliminate and may need follow-up |
| Who confirms the species | A technician or entomology lab | A technician or entomology lab; do not rely on appearance |
What are the signs of a termite problem, and could it be a Formosan colony?
Signs of any subterranean termite include discarded wings near windows, pencil-width mud tubes on foundation walls, hollow-sounding wood and bubbling paint. These signs do not separate native termites from Formosans. A technician can collect samples, and the same visible evidence leads to the same first step: a proper inspection.
Swarmers leave their wings behind, and a small pile on a sill is often the first clue. Mud tubes, which are narrow earthen tunnels running up a slab or pier, are a second sign. Wood that sounds papery when tapped, doors that begin to stick and baseboards that feel soft are signs the damage is already advanced.
Formosan activity can look more intense. Larger colonies can strip wood faster, so very heavy activity, or damage that seems out of proportion to the evidence, is a reason to tell the technician you want the species confirmed.
Check for these places around a Collin County home:
- Discarded wings on sills, in window tracks or beneath light fixtures after a warm evening.
- Mud tubes on slab edges, garage walls, crawl-space piers or around plumbing penetrations.
- Wooden fence posts, stacked firewood, landscape timbers and railroad ties touching the soil.
- Soft or hollow-sounding trim near bathrooms, sprinkler heads and downspouts.
- Cracks in the slab edge or at pipe openings where drought has pulled the clay away from the foundation.
Do Formosan termites change how a Plano or Collin County home should be treated?
The tools are the same as for native termites, soil treatment and baiting, but the plan usually becomes more thorough and the follow-up more important if Formosans are confirmed. A technician decides after an inspection. No one can quote a method before the species and the infestation are known.
Most termite work falls into two approaches. A liquid soil treatment creates a continuous barrier around the foundation. A baiting program places monitoring stations in the ground and uses slow-acting material that workers carry back to the colony. Our pages on termite control and termite bait systems explain how each is normally approached.
With Formosans, professionals tend to look harder at moisture sources, landscape timber, nearby colonies and re-inspection schedules. A neighborhood cluster, like the one in Wylie, also raises the possibility that a single house is not the full picture. Treating one lot while the neighbor's colony stays active may not end the problem.
What we can say honestly is that price depends on the species, the size of the infestation, the home's construction and whether damage repair is needed, and that the price is explained and approved before any treatment begins. We do not publish a cost figure for Formosan work.
What can a Collin County homeowner do right now?
Start with a termite inspection, remove or isolate any wood touching the ground, fix moisture sources and keep records of what you find. If a technician suspects a Formosan colony, ask for the species to be confirmed and for a written report of what was found.
Homeowners can lower the odds of any termite problem with a few practical changes. Move firewood away from the house, replace rotting fence posts, keep mulch below the slab line and direct sprinkler heads and downspouts away from the foundation. If an old railroad-tie border runs near the house, ask the technician whether it should be inspected, treated or replaced.
Buyers and sellers should be aware that a wood-destroying insect report can capture a termite finding in writing. Our guide to the WDI report when you sell a Plano home explains what the report covers and what to do with it.
If you suspect a colony, call (855) 974-4733. Phones are answered 24/7, and a local technician can be scheduled the same day when one is free. If you hire any pest-control business, it is reasonable to ask for its Texas Department of Agriculture Structural Pest Control Service business licence number.
Frequently asked questions
Have Formosan termites been found in Plano?
The documented Collin County find is in a Wylie neighborhood. We do not have a source saying Plano homes have Formosans, and we are not claiming it. The species is confirmed in Collin County, so a termite inspection in Plano is still a sensible precaution.
Are Formosan termites more dangerous than native termites?
Formosan colonies are generally described as larger and faster at consuming wood. That makes early detection more valuable. The difference shows up in how long a problem can go unnoticed, not in how easily a homeowner can spot it.
Can I tell a Formosan termite from a native one myself?
Not reliably. The two species look similar to the naked eye, and swarmers need magnification to separate. Keep a few samples in a sealed container and give them to the technician for confirmation.
Do old railroad ties in my yard mean I have Formosan termites?
No. Railroad ties are only a possible route for the species into the region. Any wood sitting in moist soil can attract native termites, too. They are worth having inspected, but their presence alone proves nothing.
Is there a Formosan termite treatment that works better than others?
Soil treatments and baits are both used. Which one fits depends on the species, the colony, the slab and the landscape. A technician decides after an inspection, and the price is approved before any work is done.
Should I worry if I am buying a home in Collin County?
It is reasonable to ask for a termite inspection or WDI report as part of any purchase, whatever the neighborhood. The report records what the inspector can see on the day. It cannot rule out hidden activity.
Sources
- Pest Control Technology: Formosan termites found in North Texas community
- Wikipedia: Formosan subterranean termite
- Texas A&M Urban Entomology: Formosan termites
- Texas Invasives: pest database entry for Formosan subterranean termite
This guide is general information for Collin County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.