What indicates the presence of subterranean termites?

The presence of subterranean termites is specifically indicated by the formation of shelter tubes. These tubes, also known as mud tubes, are created by subterranean termites to provide them with a protective environment as they travel between their underground colonies and food sources, which are typically wooden structures. The tubes help maintain the moisture that termites need to survive, as they are very sensitive to dry conditions.

While visible damage to wood can indicate both subterranean and other types of termites, it does not specifically point to subterranean termites alone. Swarming during spring is also a behavior associated with termite activity, particularly during mating season, but it relates more broadly to different termite species, not just subterranean ones. Droppings can signify termite presence, yet they are more commonly associated with drywood termites. Shelter tubes are a unique and direct indicator of subterranean termites and their behavior.