Termites are sometimes called "white ants", though they are not closely related to true ants. Two of the major types of termites are Drywood termites and Subterranean termites.
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Drywood termites live in dry, undecayed wood like limbs of trees, utility poles, posts, and lumber. Drywood termites termites do not require a lot of moisture which makes them live in dry places. They do not require constant contact with the soil for their survival like it's Sub-terranean Cousin.
In a tropical country like India Subterranean termites are of more significance as they cause extensive damage. Subterranean termites are social insects which live in colonies in the ground. They build vertical tunnels that look like mud tubes (known as shelter tubes) above ground level in the search of food. Wood is made up of Cellulosic material which is the favorite food of Subterranean termites. Termites can also damage material of organic origin with cellulosic base such as paper, cardboard, fabric, furniture, etc. However Subterranean termites are known for their voracious tendencies and can damage even non-cellulosic substances also in search of the food and shelter
Because subterranean termites will die if exposed to air for an extended period of time, therefore they need constant moisture source for their survival. The mud tunnels provide protection from the open air and direct sunlight, allowing workers to forage for the food. Subterranean termites can form runways in the form of tunnels through cracks in concrete. Therefore even RCC structures are not exempt from these termites.