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The winged reproductives are dark brown to brownish black and have two pairs of equal size wings that extend well beyond the body. Swarms are common in spring and fall, especially after a rain. After a flight, the winged males and females return to the ground and shed their wings. The wingless males and females pair off and search for sources of wood and moisture in soil. The royal couple digs a chamber in the soil near wood, enters the chamber and seals the opening. After mating, the queen starts laying eggs. The queen may live up to 25 years and lay more than 60,000 eggs in her lifetime. The eggs are yellowish white and hatch after an incubation of 50 to 60 days. Full-grown workers are soft-bodied, wingless, blind and creamy white. In early stages, they are fed predigested food by the king and queen. Once workers are able to digest wood, they provide food for the entire colony. The workers perform all the labor in the colony such as obtaining food, feeding other caste members and immatures, excavating wood, and constructing tunnels. Workers mature within a year and live from three to five years. Soldiers are creamy white, soft-bodied, wingless and blind. The head of the soldier is enormously elongated, brownish, hard and equipped with two jaws. Soldiers must be fed by workers because they cannot feed themselves. They are less numerous in the colony than workers and their only function is to defend the colony against invaders. Soldiers mature within a year and live up to five years.
Subterranean termites feed exclusively on wood and wood products containing cellulose. Termites have protozoa (microorganisms) in their intestines that provide enzymes to digest cellulose. Although termites are soft-bodied insects, their hard, saw-toothed jaws work like shears and are able to bite off extremely small fragments of wood, a piece at a time. Termites often infest buildings and damage lumber, wood panels, flooring, sheetrock, wallpaper, plastics, paper products and fabric made of plant fibers. The most serious damage is the loss of structural strength. Other costly losses include attacks on flooring, carpeting, art work, books, clothing, furniture and valuable papers. Subterranean termites do not attack live trees. Termites communicate primarily by secreting chemicals called pheromones. Each colony develops its own characteristic odor. An intruder is instantly recognized and an alarm pheromone is secreted that triggers the soldiers to attack. If a worker finds a new source of food, it lays a chemical trail for others to follow. The proportion of termites in each caste within the colony is also regulated chemically. Nymphs or immatures can develop into workers, soldiers or reproductive adults depending on colony needs. Sound is another means of communication. Soldiers and workers may bang their heads against the tunnels creating vibrations perceived by others in the colony and serving to mobilize the colony to defend itself. Mutual exchange of foods enhances recognition of colony members.
Based on normal feeding activity, it takes three to eight years to cause appreciable damage. There have been some predictions that, under ideal conditions, a termite colony of 60,000 workers may consume a one-foot length of 2" x 4" pine in 118 to 157 days. In Nebraska, the extent of damage may be different because of reduced feeding activity during the cold season. Termite damage may be located by probing wood with a screwdriver, ice pick or knife. Start inspection in the basement and use a bright flashlight. Look for mud tubes and the activity of swarmers. If necessary, get help from a professional pest control operator or advice from an experienced entomologist. A qualified professional inspector should inspect the exterior and interior surfaces of the foundation, particularly construction where wood is on or near the soil. Mud tubes are solid evidence of termite activity. Other sites requiring inspection are:
The inspector should be able to determine if termites are active or not, how old the damage may be, and if chemical treatment is necessary.
The goal is to establish a continuous insecticide barrier between the termite colony (usually in the soil) and wood in a building. Sometimes there may be a secondary termite colony above the soil (in the roof or other areas with a con-stant moisture supply) that requires additional treatment. Insecticide barriers may be established during or after building construction. In an existing building, termite treatments may involve any of the following procedures: a) mechanical alterations and/or b) use of an insecticide to treat the soil, foundation and wood. In most cases, it is beyond the ability of an untrained person to attempt the termite treatment, unless it is a spot treatment or a person has work experience in this area. Generally, termite treatment should be performed by professional pest control operators. Termite treatment requires special tools such as hammer drills, sub-slab injectors, rodding devices, engines equipped with pumps, protective equipment, etc. Several insecticides are registered in Nebraska for termite control. Several baits also are available for termite control. Some of these baits are available only through commercial pest control professionals. Over the counter bait products may not provide satisfactory termite control. Make sure to discuss and understand the contract and conditions involved in use of baits for termite control if you hire a pest control professional. Please refer to the University of Nebraska, Cooperative Extension Division publication EC91-1556, Subterranean Termites and Their Control. All of these insecticides control termites if applied properly.
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