Subterranean Termites

Subterranean termites require moist environments. To satisfy this need, they usually nest in or near the soil and maintain some connection with the soil through tunnels in wood they construct. These tunnels are made of soil with bits of wood or even plasterboard (drywall). Much of the damage they cause occurs in foundation and structural support wood. Because of the moisture requirements of subterranean termites, they are often found in wood that has wood rot.

The western subterranean termite, Reticulitermes hesperus, is the most destructive termite found in California. Reproductive winged forms of subterranean termites are dark brown to brownish black, with brownish gray wings. On warm, sunny days following fall or sometimes spring rains, swarms of reproductives may be seen. Soldiers are wingless with white bodies and pale yellow heads. Their long, narrow heads have no eyes. Workers are slightly smaller than reproductives, wingless, and have a shorter head than soldiers; their color is similar to that of soldiers. In the desert areas of California, Heterotermes aureus, is the most destructive species of subterranean termites. Another destructive species in this group, the Formosan subterranean termite, Coptotermes formosanus, is now in California but restricted to a small area near San Diego. Unlike the western subterranean termite, Formosan subterranean termites swarm at dusk and are attracted to lights.