Scientific Name: Coptotermes formosanus | Reviewed by The PCC Research Team
The Formosan Subterranean Termite is frequently referred to as the “Super Termite” by the pest control industry, and for good reason. Originally native to southern China and Taiwan, this highly invasive species is the most aggressive and structurally devastating insect in the United States.
While a native California subterranean termite colony might take years to cause significant structural damage, a mature Formosan colony can completely hollow out the load-bearing framing of a house in as little as six months.
The “Cliff Notes”: Why They Are So Dangerous
- Massive Colonies: A single Formosan colony can contain up to 10 million individual termites (compared to the 100,000 typical of native California subterranean termites).
- Rapid Consumption: Due to their sheer numbers, they can consume up to 1 pound of structural wood per day.
- Chewing Power: While they only eat wood, their mandibles are incredibly strong. They frequently chew through drywall, rubber, foam insulation, and underground electrical cable covers just to reach a timber food source.
- Above-Ground Nests: Unlike other subterranean species, they can sever their connection to the soil and live entirely in your walls if there is a plumbing leak (known as a “Carton Nest”).
Identification: Formosan vs. Native Subterranean
To the naked eye, Formosan workers look virtually identical to standard Western Subterranean termites (pale, creamy white, and blind). The key to identifying them lies in looking at the “Soldier” caste and the flying “Swarmers.”
| Feature | Formosan Termite (“Super”) | Western Subterranean Termite |
|---|---|---|
| The Soldier Head | Soldiers have an oval, distinctly teardrop-shaped head. | Soldiers have a distinctly rectangular, blocky head. |
| Defense Mechanism | Highly aggressive. When disturbed, soldiers secrete a visible, white sticky defensive fluid from a pore on their head called the fontanelle. | Will bite, but do not secrete a white defensive liquid from their heads. |
| The Swarmers (Alates) | Swarm at night, usually in late spring to mid-summer. They are pale yellow-brown and heavily attracted to outdoor lights. | Swarm during the day, typically on warm mornings after a spring rain. They are completely black. |
The golden rule of pest control is that subterranean termites must return to the soil to get moisture, otherwise they dry out and die. Formosan termites break this rule. If your home has a slow plumbing leak, a leaking roof, or condensation in the walls, Formosan termites will construct an above-ground “Carton Nest” inside the wall void. Made of chewed wood, soil, and saliva, this sponge-like nest traps the leaking water, allowing millions of termites to live indefinitely in your walls without ever touching the dirt outside.
How to Eradicate Formosan Termites
Because they are a subterranean species that can also build above-ground carton nests, treating a Formosan infestation often requires a highly customized, dual-approach strategy that is significantly more rigorous than standard termite control.
Step 1: The Soil Barrier (Trenching)
Just like standard subterranean termites, the exterminator must establish a non-repellent chemical barrier (using Fipronil or Imidacloprid) around the foundation. This cuts off the primary colony living deep in the yard from accessing the structure. Read our Trenching Guide here.
Step 2: Destroying the Carton Nests (Foaming)
If the inspector locates a carton nest inside a wall, trenching the exterior will not kill them (because they don’t need to go back to the soil). The technician must drill directly into the infested drywall and inject an expanding insecticidal foam (like Termidor Foam). The foam expands to fill the entire void, collapsing the carton nest and killing the trapped colony.
Step 3: Moisture Elimination
Formosan termites cannot survive above ground without a dedicated water source. You must hire a plumber or roofer to fix the leak that allowed the carton nest to survive in the first place.
Do Not Ignore Formosan Termites
Given their ability to consume structural wood at an alarming rate, Formosan termites require immediate professional intervention. Use our directory to find a verified California structural pest control operator equipped to handle severe “Super Termite” infestations.
Call For An Emergency Inspection: (866) 204-1751Frequently Asked Questions
Q: Will tenting (fumigation) kill Formosan termites?
A: Tenting a house with Vikane gas will kill the Formosan termites currently living inside the above-ground carton nest. However, because the primary colony is located deep underground, the gas will not reach them. As soon as the tent comes off, the underground colony will travel right back up the mud tubes and re-infest the home. You must trench the soil.
Q: Where are Formosan termites found in California?
A: Historically isolated to the deep south (Louisiana, Florida, Texas), Formosan termites have established isolated pockets in Southern California, particularly in San Diego County (La Mesa) and parts of Los Angeles and Orange Counties, often transported via infested railroad ties or potted plants.
Q: Do Formosan termites bite humans?
A: The soldier caste possesses large, sharp mandibles designed to defend the colony against ants. If you break open a mud tube or carton nest, the soldiers will swarm and can deliver a noticeable pinch to human skin, though it is not medically dangerous or venomous.