Formosan Termites in Alabama: Are They Here, and Should You Worry?

The termite in nearly every Alabama house is the Eastern subterranean, and it is serious enough on its own. The Formosan subterranean termite is a different animal: an introduced species with colonies in the millions, an appetite for a wider range of wood, and a habit of building nests above ground inside structures. It is well established along the Gulf Coast from Mobile to New Orleans, and it has been detected inland. Here is what that means for a homeowner in central or north Alabama, without the alarm.

What makes Formosans different

Colony size, mainly. A mature Eastern subterranean colony holds a few hundred thousand termites; a mature Formosan colony holds several million. That translates directly to how fast damage accumulates. Formosans also build carton nests — dense structures of chewed wood, soil, and saliva — inside walls and even in the upper floors of a building when a moisture source lets them survive away from the ground. They attack live trees, boat docks, utility poles, and a broader range of materials than the native species. The swarmers are larger, yellowish-brown, and swarm at dusk in late spring, often around lights, where natives swarm by day.

Where they are in Alabama

Mobile and Baldwin counties have had established populations for decades. Detections have followed the transport corridors north — I-65 especially — because Formosans move in infested landscape timbers, railroad ties, and used lumber. There have been confirmed finds in the Montgomery area and scattered reports farther north. In the Birmingham metro, Lake Martin, and the Tennessee Valley the native Eastern subterranean remains overwhelmingly the species we find. That said, an inspector who is not looking for Formosan signs will not find them, and we look.

What it changes about protection

Less than the headlines suggest, because a well-run subterranean termite program already covers it. In-ground bait systems like Sentricon® Always Active™ work on Formosan colonies the same way they work on natives — foragers carry the bait back and the colony is affected from the inside — and the monitoring schedule is what catches a new colony early. What changes is the stakes of skipping the annual inspection: with a colony that size, a year of unnoticed activity is a much larger repair. It also raises the value of not bringing infested material onto the property — used railroad ties, landscape timbers of unknown origin, salvaged lumber from the coast.

What to watch for

The same signs as any subterranean termite — mud tubes, hollow wood, blistered paint, swarmers — plus two Formosan-specific ones: swarms at dusk around exterior lights in April and May, and carton material (looks like hardened, layered dirt) inside a wall or behind trim. Either one is worth a same-week inspection. What termite damage looks like, species aside, is in termite damage signs.

The practical answer

If your home is on an active termite protection agreement with annual inspection, Formosans do not change your risk much; the system is built for them. If it is not, they are one more reason to schedule the free WDO inspection and start one. Termite work at EnviroCare is priced after that inspection, never over the phone, and qualifying homes carry up to $1,000,000 in EnviroCare damage repair coverage, subject to the terms of the agreement.

Call the office nearest you — Birmingham (205) 991-2882, Alabaster (205) 940-6360, Lake Martin / Alex City (256) 234-6162, or Huntsville (256) 937-7676 — or request a free quote and we will take it from there.

No One Cares Like EnviroCare.