Why Baton Rouge, specifically
Formosan subterranean termites arrived in the Gulf South through port cities and found a perfect climate: heat, humidity, and rain in every month. Louisiana sits at the top of national worst-state rankings for termite damage, and Baton Rouge shares New Orleans' species mix and weather. There is no winter die-off and no real off-season — colonies feed twelve months a year.
Layered on top of the Formosans, native subterranean termites work the same houses from ordinary soil colonies. A Baton Rouge home can host both, and often does.
How Formosans are different
- Colony scale: millions of individuals, foraging over wide areas through interconnected tunnel systems.
- Aerial nests: carton nests built inside walls and roofs hold their own moisture — the colony may never touch soil, so ground barriers alone can miss it.
- Speed: given their numbers, Formosans damage structural wood far faster than native colonies.
- Appetite: beyond framing — books, insulation, flooring, and even the coverings of utility lines are on the menu.
Swarm season: May through July evenings
Formosan alates swarm at dusk on warm, humid evenings, drawn to lights in numbers that can coat windows and doorways. Each swarm is thousands of chances for a new colony — pairs that land, shed their wings, and find damp wood. Turning off exterior lights during peak swarm evenings and clearing wings and dead alates from entries are small, real defenses. A swarm emerging indoors — from a wall void, a bath trap, a window frame — means an aerial or soil colony is already established in the structure.
Signs to walk your house for
- Mud tubes on foundations, piers, and in garages — the native species' highway, and one Formosan route.
- Soft, blistered, or bulging wall sections with no plumbing behind them — possible carton nest.
- Windows and doors that suddenly stick — frames being eaten change shape.
- Wings on sills after warm evenings, especially near lights.
- Hollow sounds when tapping baseboards, and floors that feel spongy.
Found any of them? Call (225) 555-0147. You'll be connected with a local company for an inspection that checks both soil and structure — because in Baton Rouge, checking only the soil line is checking half the problem.
Formosan termite FAQ
What makes Formosan termites worse than regular termites?
Colony size and independence. A Formosan colony can number in the millions, and unlike native subterraneans, Formosans can build aerial nests inside walls and roofs that don't need soil contact — so a soil treatment alone may not reach them. Damage accumulates much faster.
When do Formosan termites swarm in Baton Rouge?
Evenings from roughly May through July, after warm humid days. They are strongly attracted to light — porch lights, street lights, lit windows — and can appear in enormous numbers. A heavy swarm around your house is a colonisation attempt in progress.
What is an aerial nest?
Formosans build carton nests — structures of chewed wood and saliva — inside wall voids, attics, and roofs. The nest holds moisture, letting the colony live entirely above ground. Signs include unexplained wall bulges, soft spots, and moisture stains with no plumbing leak behind them.
My home has a termite contract from years ago. Am I covered?
Only if it is current. Agreements lapse, companies change hands, and treatment methods age. If you can't produce a current agreement, assume the home is unprotected and get an inspection — in Baton Rouge, an unprotected home is an outlier, and not in a good way.