Termites are social insects
that eat wood. There are two basic types of termites, those that
live entirely in wood, and those that can tunnel into the ground.
The wood-inhabiting termites
are the more primitive type. Their colonies consist of excavated
galleries inside dead branches or logs. Once the dead wood is
consumed the colony dies. Since single pieces of dead wood can not
sustain a very large family, their colonies rarely ever number more
than a few thousand termites. These wood inhabiting termites have a
primitive type of caste system. Instead of having true workers they
have false workers which are older nymphs who have undergone a
regressive molt and that temporarily stay in the nest galleries and
help their parents to raise more brothers and sisters. The soldiers
have enlarged orange heads and long toothed jaws. The soldier's main
purpose is to defend the colony from termite's mortal enemies, the
ants. Most nymphs gradually grow wing pads and then transform into
winged termites called alates. The alates fly from the colony at a
certain time of the year to start new colonies.
Among the wood inhabiting
termites, there are various specialists such as rotten wood
termites, damp wood termites and dry wood termites. Dry wood
termites can be very serious pests of houses and furniture. All wood
inhabiting termites produced fecal pellets. If you have dry wood
termites in your house you are likely to see the coarse sand-like
pellets long before you discover the termites themselves.
Most termites are the
subterranean type and are able to tunnel in the soil. The ability to
tunnel allows them to find many separate pieces of wood, on which to
feed. Since they are not limited to one piece of wood, their
colonies can be much bigger than those of wood-inhabiting species.
Usually their colonies number from hundreds of thousands to several
million. The mother of the colony is usually quite grossly pregnant.
These mothers are the mothers of all mothers, so to speak. Hence,
they are called queens. The soil-tunnelling termites have a more
advanced caste system with true workers. True workers are never able
to become alates although they can become soldiers and sometimes
they even transform into special reproductives called ergatoids.
Soldiers of subterranean termites have a gland on the head that
secretes defensive chemicals. The soldier jaws are modified in many
weird and wonderful ways; they may be sword-like, serrated, toothed,
hooked, rod-like, etc. Some soldiers have extraordinary snapping
mandibles. In another group, the mandibles are regressed to tiny
points while the defensive gland is produced forward as a nose;
these are the nasute termites. Many subterranean termites have
specialized diets and may eat plant litter, grass, dung or humus,
instead of wood. In tropical areas many subterranean termites build
nests or mounds which are among the most impressive examples of
animal architecture.
Subterranean termites can be
very serious structural pests of houses. They do not produce fecal
pellets like the drywood termites. Instead, the entry of
subterranean termites into a house is usually revealed by the
presence of mud shelter tubes on walls. Soil inhabiting termites can
also be serious pests of rangelands, tropical forestry and tropical
agriculture. However, 90% of termite species may be considered
highly beneficial in their unique keystone ecological roles in
breaking down wood; turning, aerating and enriching the soil; and
providing food and harborage for many other forms of life.
TERMITE
INSPECTIONS