Louisiana homeowners live under some of the most intense termite pressure in the United States. With Formosan subterranean termites actively feeding year-round and drywood termites targeting attic timbers and furniture across the state, recognizing an infestation early is the difference between a manageable treatment bill and a five-figure structural repair. These seven warning signs are what licensed Louisiana inspectors look for first — and what every homeowner should know how to spot before a colony grows from a minor problem to a structural emergency.
1. Mud Tubes on Foundation Walls, Piers, or Concrete
Mud tubes are the most reliable indicator of subterranean termite activity. Subterranean termites — including Louisiana's dominant Formosan species — cannot survive exposure to air, so they build pencil-width earthen tunnels to travel between their underground colony and above-ground food sources. These tubes appear most commonly on foundation walls, piers, and the exterior of concrete block, especially in the bottom 18–24 inches. In homes throughout coastal Louisiana and the New Orleans metro area, Formosan termites also build carton nests inside walls and construct aerial tubes entirely within the structure — never touching the ground at all.
If you find a mud tube, the most important thing is not to break it open — a professional needs to assess whether it's active. Call (833) 838-1832 for a same-day inspection.
2. Hollow-Sounding or Blistered Wood
Subterranean termites eat wood from the inside out, consuming the soft spring wood while leaving a thin outer shell intact. This creates a characteristic hollow sound when you tap an infested board with a screwdriver handle. In Louisiana's older housing stock — bungalows in Baton Rouge's Mid City, raised cottages in Thibodaux, pier-and-beam homes throughout the bayou parishes — floor decking and wall framing can sustain extensive internal damage before anything is visible on the surface. If tapping produces a papery, hollow resonance in an area that should be solid, probe gently with a screwdriver tip. Infested wood will punch through with little resistance, revealing the characteristic honeycomb gallery pattern inside.
3. Termite Swarmers or Discarded Wings
Termite swarmers are the reproductive members of a mature colony. In Louisiana, Formosan termite swarms occur primarily from April through June, often peaking on warm evenings after spring rains — a phenomenon familiar to anyone who has seen the streetlights in the French Quarter clouded with insects. Drywood termites swarm at different times throughout the year. Finding swarmers or their shed wings near windows, sliding glass doors, or light fixtures inside your home means a colony is either established inside the structure or very nearby. Do not dismiss this as "just flying ants" — termite and ant swarmers are commonly confused but require very different responses.
4. Termite Frass (Drywood Termite Droppings)
Drywood termites push their fecal pellets — called frass — out of small kickout holes in the wood they're infesting. These pellets are tiny, uniform, and have a distinctive six-sided shape when viewed under magnification. In practical terms, you'll notice small piles of what looks like coarse sand or sawdust below an entry hole in a wood surface. This is a signature sign of drywood termite activity that does not occur with subterranean species. If you find frass piles on windowsills, baseboards, or below ceiling beams, you likely have an active drywood infestation that may require targeted drywood termite treatment or fumigation depending on its extent.
5. Tight-Fitting Doors and Windows That Weren't a Problem Before
Termite activity generates moisture inside wood as it breaks down cellulose. This moisture causes wood to swell and warp — producing the same symptom as a seasonal humidity change, but localized to specific frames. If a door or window in your Louisiana home suddenly starts sticking without an obvious weather-related explanation, especially in one corner or along one edge, it's worth having the framing inspected. This symptom is particularly easy to miss because Louisiana homeowners are accustomed to humidity-related swelling — but when a door that has always operated smoothly suddenly won't close properly in the same season it always has, that's a red flag worth investigating promptly.
6. Visible Galleries in Exposed Wood
If you're able to see exposed wood in a crawl space, basement, or during a renovation — and that wood shows a pattern of interconnected tunnels just below the surface or running along the grain — you're looking at termite galleries. Subterranean termite galleries run parallel to the wood grain and are often packed with soil and frass. Drywood termite galleries are smooth-walled, free of soil, and cut across the grain. Both types can be present simultaneously in Louisiana homes, particularly in Houma and the Terrebonne Parish area where soil moisture levels and coastal proximity create ideal conditions for both species. A professional inspection can assess damage extent and recommend the right termite treatment approach for your specific situation.
7. Clicking or Rustling Sounds Inside Walls
Large Formosan termite colonies produce audible sounds. Soldier termites bang their heads against tunnel walls to signal danger — a sound you may hear as a dry tapping or clicking if you press your ear against an infested wall. Worker termites moving through large gallery systems in significant numbers also produce a faint rustling sound. These sounds are more noticeable in older homes with thinner wall construction. While not definitive, audible activity inside walls combined with any of the other six warning signs above is sufficient reason to call for an immediate inspection. Don't wait until the sounds become louder — by then, the colony has grown substantially.