1. Formosan Subterranean Termites
Coptotermes formosanus — "Super Termite"
Formosan subterranean termites arrived through the Port of New Orleans following World War II, likely in wooden shipping materials. They are now permanently established across the entire Gulf Coast and have spread well into northern Louisiana.
What makes Formosan termites uniquely dangerous isn't just their size — it's their colony scale. While a typical eastern subterranean colony might have 200,000–500,000 workers, a mature Formosan colony can exceed 10 million. That scale translates directly to feeding speed: a mature Formosan colony can consume approximately a pound of wood per day.
Unlike eastern subterranean termites, Formosan termites can build secondary "carton nests" inside wall cavities using a mixture of soil, chewed wood, and saliva. This means they can keep feeding even if the ground-level entry point is treated — making correct identification and comprehensive treatment critical.
In New Orleans and Metairie, Formosan pressure is so intense that treatment is essentially mandatory for any wood-frame structure. The historic French Quarter has lost an estimated 30–40% of its original wood structures to Formosan damage since the 1970s.
Treatment: Liquid termiticide soil treatment (fipronil-based products are the current gold standard), baiting systems using chitin synthesis inhibitors (Sentricon, Trelona), or a combination of both. A professional inspection to map infestation extent is critical before choosing a treatment approach.
2. Eastern Subterranean Termites
Reticulitermes flavipes — Most Widespread U.S. Species
Eastern subterranean termites are native to North America and found across the entire state of Louisiana. In northern parishes — Shreveport, Monroe, Alexandria — they are the primary termite species, since Formosan populations are less established in cooler inland areas.
Eastern subterranean termites must maintain soil contact to survive. Their colonies live entirely underground and tunnel up through soil to reach wood. The most common sign — mud tubes — appears along foundations, piers, and interior walls where the colony bridges the gap from soil to wood above.
They swarm earlier in the year than Formosan termites: February through April, typically on warm, sunny days (above 60°F) around late morning. Swarmers are smaller than Formosan swarmers and have smoky gray wings without visible hair.
Treatment: Liquid termiticide soil treatment is highly effective. Bait systems (Sentricon, Trelona) work well as standalone or supplemental treatment. Physical barriers around new construction are an excellent preventive measure.
3. Drywood Termites
Incisitermes snyderi & Related — No Soil Required
Drywood termites are fundamentally different from both subterranean species: they live entirely inside dry wood and don't need any soil contact. A pair of swarmers can establish a new colony inside attic framing, a wood windowsill, hardwood floors, or even furniture — then go undetected for years.
In Louisiana, drywood termites are most prevalent in coastal communities — New Orleans, Houma, Morgan City, and the coastal parishes. They are less common in northern Louisiana but present statewide.
The primary identification sign for drywood termites is frass: small, oval, six-sided fecal pellets about 1mm long that they push out of tiny kick-out holes in infested wood. Finding a small pile of these pellets (which look like tiny seeds or coarse sand) below a wood surface is a strong indicator of drywood termite activity.
Treatment: Localized infestations can be treated with spot treatments — drilling small holes and injecting insecticide directly into infested wood. Whole-structure fumigation (tenting) with sulfuryl fluoride is required for severe or widespread infestations. Soil treatments and bait systems have no effect on drywood termites.
Side-by-Side Comparison
| Feature | Formosan | Eastern Subterranean | Drywood |
|---|---|---|---|
| Origin | Invasive (Asia) | Native | Native |
| Colony size | 1–10M+ workers | 60K–2M workers | 2,500–10K workers |
| Needs soil? | Usually (carton nests possible) | Yes, always | No |
| Mud tubes? | Yes | Yes | No |
| Frass pellets? | No | No | Yes |
| Swarm time | April–June, dusk | Feb–April, daytime | Aug–Oct, afternoon |
| Wing appearance | Hairy, yellowish | Smooth, gray | Clear, smooth |
| Bait treatment works? | Yes | Yes | No |
| Soil treatment works? | Yes | Yes | No |
| Fumigation needed? | Rarely | Rarely | Severe cases |
How to Tell Which Species You Have
If you've seen swarmers, mud tubes, frass, or other signs, here's a quick decision tree to narrow down the species before calling for an inspection:
- Did you see flying termites (swarmers)?
- At dusk in April, May, or June → likely Formosan subterranean
- During the day in February, March, or April → likely Eastern subterranean
- In the afternoon from August through October → likely Drywood
- Did you find mud tubes? (brown pencil-width tunnels on walls, piers, or foundation)
- Yes → Subterranean species (Formosan or Eastern — requires closer inspection to differentiate)
- No mud tubes, but found small oval pellet piles below wood → Drywood
- Where is the damage pattern?
- Galleries follow wood grain with hollow center and mud lining → Subterranean
- Galleries cut across wood grain, clean walls (no mud) → Drywood
Accurate species identification affects the entire treatment strategy. If you're in Lafayette, Baton Rouge, or the surrounding areas, both Formosan and eastern subterranean termites are common — a dual-species inspection is often warranted. Call (833) 838-1832 for a same-day inspection anywhere in Louisiana.