Formosan Termites

Overview

Formosan termites are a subterranean species of termite with three distinct castes: alates (or reproductive), soldiers and workers. Often referred to as “super termites,” they are the most voracious, aggressive and devious of over 2,000 termite species known to science, chewing through wood, flooring and even wallpaper undetected.

What Formosan Termites Look Like

Alates, or swarmers, are about 5/16 inch (14-15mm) in overall length, including their wings. Their bodies are pale yellow to brownish yellow in color. They have translucent wings that are densely covered with small hairs.

Formosan termite soldiers have heads that are rounded on the sides and tapered toward the front, whereas indigenous subterranean termites have rectangular heads. Their mandibles lack teeth.

Another sign of a Formosan termite infestation is damaged wood that sounds hollow when tapped. The wood often appears to have been eaten away along the grain pattern. Learn more about the signs of a termite infestation .

To prevent a future Formosan termite infestation, homeowners should consider scheduling a professional termite inspection annually – or at least once every 3-5 years, according to the American Society of Home Inspectors. There are also some things that can be done both inside and outside of the home, starting with eliminating sources of moisture. Inside, homeowners should reduce humidity in crawl spaces, attics and basements. Outdoors, divert water away from the home's foundation to prevent Formosan termite access with properly functioning downspouts, gutters and splash blocks. Homeowners should also store firewood at least 20 feet away from the home and maintain a one-inch gap between soil and wood portions of the home. It’s also good practice to routinely inspect the foundation of the home for signs of mud tubes, visibly damaged wood and wood that sounds hollow when tapped.

Behavior & Habitat

Formosan termites have similar habits to those of eastern subterranean termites. They live in huge underground colonies with an average of 350,000 workers, invading structures using mud tubes constructed up from the soil to wood. Formosans may also establish secondary carton nests above ground if a substantial moisture supply is available. Carton nests are made of soil and wood cemented together with saliva and termite feces.

Formosan termite aerial nests are more often encountered than those of eastern subterranean termites. In fact, they account for about 25% of the structural infestations in Florida and for about 50% of those in high-rise structures in Honolulu, Hawaii.

Formosan termite queens can produce more than 1,000 eggs per day. New colonies are created when winged termites, also known as swarmers, are released from the colony and swarm. Swarming usually occurs in the evening hours following a warm, rainy day in the late spring or early summer. A single colony of Formosan termites may release over 70,000 swarmers.

Signs of an Infestation

There are a few red flags signaling a Formosan termite problem. The first sign that an area is infested with Formosans is the presence of swarmers, or winged reproductives. Swarmers are often attracted to lights, so homeowners should keep an eye out for them (and their discarded wings) near windowsills, doors, lights and vents.

Are Formosan Termites Dangerous?

Because of their aggressive nature, Formosan termites are difficult to control once they infest a structure. Although colonies of several million termites are known, a mature Formosan termite colony can eat about 31 grams or 1+ ounce per day. At this rate, such a colony could completely consume one foot of 2X4 wood in 25 days – causing severe structural damage to a home in as little as six months.

In addition to structures, Formosans infest living trees and shrubs, utility poles, landscape timbers, wooden railroad trusses and even boats. They are also known to chew through the coverings of telephone and electric cable insulation, resulting in costly damage and power outages in cities.

The National Pest Management Association estimates that in the U.S., termites collectively cause more than $6.8 billion in damage each year.

Prevention & Control

To prevent a future Formosan termite infestation, homeowners should consider scheduling a professional termite inspection annually – or at least once every 3-5 years, according to the American Society of Home Inspectors. There are also some things that can be done both inside and outside of the home, starting with eliminating sources of moisture. Inside, homeowners should reduce humidity in crawl spaces, attics and basements. Outdoors, divert water away from the home's foundation to prevent Formosan termite access with properly functioning downspouts, gutters and splash blocks. Homeowners should also store firewood at least 20 feet away from the home and maintain a one-inch gap between soil and wood portions of the home. It’s also good practice to routinely inspect the foundation of the home for signs of mud tubes, visibly damaged wood and wood that sounds hollow when tapped.

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Common questions about Formosan Termites

Are Formosan Termites dangerous?

Because of their aggressive nature, Formosan termites are difficult to control once they infest a structure. Although colonies of several million termites are known, a mature Formosan termite colony can eat about 31 grams or 1+ ounce per day. At this rate, such a colony could com

What do Formosan Termites look like?

Alates, or swarmers, are about 5/16 inch (14-15mm) in overall length, including their wings. Their bodies are pale yellow to brownish yellow in color. They have translucent wings that are densely covered with small hairs.

What are signs of Formosan Termites?

There are a few red flags signaling a Formosan termite problem. The first sign that an area is infested with Formosans is the presence of swarmers, or winged reproductives. Swarmers are often attracted to lights, so homeowners should keep an eye out for them (and their discarded

How do I get rid of Formosan Termites?

To prevent a future Formosan termite infestation, homeowners should consider scheduling a professional termite inspection annually – or at least once every 3-5 years, according to the American Society of Home Inspectors. There are also some things that can be done both inside and

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