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Termites in the United States:
What and Where?
Out of the more than 2,000 termite species
worldwide, only about 50 species can be found in the United States.
Of those species, as many as 20 are considered structural pests,
which means they have been known to infest and eat wood in structures.
Termites are found in every state in the U.S., except Alaska. Because
they thrive in warm climates, termite activity is greatest in the
South, Southeast, West and Southwest. The three most important groups
of termites in the U.S. in terms of damage are subterranean,
drywood and dampwood termites.
Subterranean Termites:
Subterranean termites, which live underground
in the soil, are the most widespread and destructive group of termites
in the U.S. They are most common in the South and Southeast. There
are several species of subterranean termites that are of economic
importance to U.S. homeowners, including:
a. The Eastern Subterranean Termite: This
species is the dominant termite species in the Eastern half of the
country, and is the most economically important termite in the U.S.
b. The Dark Southeastern Subterranean Termite:
Related to the Eastern Subterranean Termite, this species is found
principally in the Eastern and Southeastern parts of the country.
c. The Light Southeastern Subterranean Termite:
This species is similar in distribution and importance to the Dark
Southeastern Subterranean Termite.
d. The Formosan Subterranean Termite: Native
to China, this is the most destructive termite species in the U.S.
The Formosan termite is found occasionally in most Southeastern
states and southern California, and is the only species of subterranean
termite found in Hawaii.
e. The Western Subterranean Termite: While
this termite species is the most abundant subterranean termite species
in the West, it can also be found as far east as Idaho and Nevada.
f. The Arid Land Subterranean Termite: Found
primarily in arid regions (prairies) of the Rocky Mountain states,
the Arid Land Subterranean Termite is the most common subterranean
termite in Arizona.
g. The Desert
Subterranean Termite: This species is a major structural pest in
areas where it exists, mainly in southern Arizona and parts of California.
Drywood Termites:
Drywood termites can live in dry, sturdy
wood and are found along the East Coast from the Mid-Atlantic states
to South Florida, along the Gulf Coast, through the Southwest into
California, and in Hawaii. These termites infest wood products,
such as furniture, picture frames and the woodwork of buildings.
The drywood termite species that are most detrimental to homeowners
include:
a. The Southeastern Drywood Termite: This
species is the most common drywood termite species in the South
and Southeast.
b. The West Indian Drywood Termite: Also
common in the South and Southeast, this species is reportedly the
only drywood termite species found in Hawaii.
c. The Western Drywood Termite: Found in
the Western and Southwestern U.S., it is also found sporadically
in the Southeast.
d. The Desert Drywood Termite: This drywood
termite species is found mainly in Arizona and parts of southern
California.
Dampwood Termites:
Dampwood termites live in moist and decaying
wood, so this type of termite is less likely than drywood and subterranean
termites to infest a home. Structure-infesting dampwood termites
are most common in the Pacific Coast states, beginning in northern
California and continuing north. Termite Species
Termites live in colonies, which means they
live and work together to gather food and raise their young (larvae).
And in the same way that children and parents have different roles
and responsibilities in their homes, termites have different jobs
in their colonies. These jobs determine when and why certain termites
leave the nest to start new colonies. Where these termites form
a colony depends on the individual termite species and its ability
to survive in drier or cooler climates.
Formosan Termites
Formosan termites
are the most destructive species of subterranean termite in the
United States. Formosan termites may be distinguished from other
subterranean termite species by their slightly larger size and yellowish
brown bodies. While subterranean termites typically require soil
contact to receive the moisture they need to survive, Formosan termites
have the ability to form cartons (nests inside the colony made of
chewed wood, soil and undigested cellulose) to retain water for
the colony until they can find a more permanent water source.
Formosan termite
colonies are typically larger than subterranean colonies, numbering
up to hundreds of thousands of members. It is this size difference
- not the speed of Formosan termites' eating habits - that allows
them to cause significantly more severe damage than other species
of termites.
This species of subterranean termite can be found across the southern
United States, from California to Louisiana to Florida and Georgia.

Dampwood Termites
Dampwood termites live only in wood with
high moisture content. Most dampwood termite species do not require
contact with the soil to survive. Dampwood termites are often found
in moist or decaying wood in logs, stumps and dead trees. They may
infest buildings, utility poles and wood piles if these structures
have wood-to-ground contact or areas moistened by water leaks -
however, infestations in structures are rare. Dampwood termites
leave few external signs of wood damage, with the amount and pattern
of damage depending on the degree of wood decay. Dampwood termites
are visibly larger than other termite species. There are several
species of dampwood termites in the United States, the majority
of which live in the Pacific coast and Southwest regions, and from
central to southern Florida.

Subterranean Termites
Subterranean termites live in the soil underground.
This termite species prefers to eat soft, spring wood fiber, which
means wood damaged by subterranean termites has a honeycombed appearance,
with only the grain left behind. Unlike drywood termite colonies,
subterranean colonies can contain thousands of workers. Subterranean
termites are found in every state in the U.S., except Alaska. Subterranean
termite infestations are most common in warmer climates, particularly
in southern and southeastern states.
Drywood Termites
Just as the name suggests, drywood termites
live in dry wood. Unlike many other termite species, they do not
need contact with the soil to survive. This termite species can
tolerate dry conditions for long periods of time, since it receives
all of the moisture it needs from the wood it consumes and the metabolism
it uses to digest the wood.
Drywood termites commonly target the wood
in your home's structural timbers, framing, furniture and hardwood
flooring. Wood consumed by drywood termites appears very clean and
smooth - as if the wood had been smoothed by sand paper.
Drywood termites can infest several different areas in your home,
forming separate colonies in your basement, attic or porch. They
are usually found in warmer climates that do not reach freezing
temperatures in the winter. However, this species of termite can
survive in northern climates in homes with air conditioning.
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