Treatment for Subterranean Termites

1) Repellent Liquid Termiticide

How does a repellent liquid termiticide work to control subterranean termites?

Termiticide is injected into areas of the soil around a home’s foundation, preventing termites from entering into the structure. The slab is drilled and the soil is treated underneath. Trenches are dug around the foundation outside and within crawl spaces and filled with termiticide, creating a chemical barrier which the termites will not be able to pass. The termiticide repels the termites by blocking them off from their food source. Ideally the termites are turned away from the structure and the entire nest will be killed.
Advantages:
Provides immediate protection for the structure
Relatively low cost and long lasting
Disadvantages:
Termites are not killed, just turned away from the chemical
They often find tiny gaps in the treatment and tunnel through them
Relative costs:
Usually the least expensive of the 3 treatments
Preparing for the liquid injection is labor intensive and can be costly
About 4 gallons per 10 linear fee of termiticide are used in treatment
Examples include Dragnet, Cyper TC (Demon TC) Termiticide, Prelude, Prevail FT, Talstar and Tribute

2) Non-repellent Liquid Termiticide

How does a non-repellent liquid termiticide work to control subterranean termites?

Also known as a delayed termiticide treatment, this method of non-repellent termite treatment works much more slowly than a repellant treatment. The structure is drilled, trenched and injected as with the repellent liquid, but the termiticide is not repellent to the termites. The termites cannot detect the non-repellent termiticide in the soil so they tunnel into it and are killed. One advantage of this is that it can be transmitted to other members of the termite infestation with a single dose. This method is often used in conjunction with bait stations.
Advantages:
Provides immediate protection for the structure
Most effective treatment of the 3 because it kills foraging termites
Disadvantages:
Premise can break down in water
May dissipate more quickly in the soil than repellent termiticides
Relative costs:
Can be more expensive than repellent treatment
Termiticide is more costly
Application is the same as repellent treatment
Labor costs are equivalent
Examples include Premise and Termidor

3) Bait Systems

How does a bait system work to control subterranean termites?

Wood-monitoring stakes are placed in the ground around the structure and inspected monthly or quarterly. If termites are found inside a station, the bait is put in. Termite baits use slow working poisons, while also taking advantage of the termite’s natural tendencies. Termites live in close contact with one another in colonies in underground nests. After a termite consumes the bait, it returns to its nest and spreads it round, helping to eliminate more termites in the nest.
Advantages:
Environmentally friendly
Can attack a whole nest to kill many termites
Extremely low toxicity to humans and pets
Disadvantages:
Not as effective as the other methods
Structure of bait systems is not directly protected
No means of attracting termites into the monitors
May take a long time to begin
Kills many termites, but survivors can move to a new location
Termite infestation can recurr
Relative costs:
Sentricon is the most expensive treatment
station installation/monitoring are responsible for most of the cost
Bait products are usually priced between barrier treatments and Sentricon
Examples include FirstLine, Sentricon and Exterra, designed to kill the entire colony