A mud tube may show where subterranean termites have traveled. A group of winged termites, called swarmers, may indicate activity nearby. Neither sign alone tells you what treatment is needed.
Mud tubes protect movement
Subterranean termites may build earthen tubes across exposed surfaces between soil and structural materials. Tubes can appear on foundation edges, garage walls, piers, plumbing penetrations, or hidden transitions. Their soil-like construction can help distinguish them from a stain, but an inspector should consider the tube together with other evidence at the property.
Photograph the tube beside a familiar object for scale and take a wider image showing the wall, slab, or room. Do not scrape away every section. If part is already broken, note whether it was repaired or extended later and share that observation with the inspector.
Swarmers are easy to confuse with flying ants
A sudden group of winged insects or a collection of discarded wings often prompts a termite call. Body shape, antennae, and wing proportions can help trained identification, but crushed insects and blurry phone photos make mistakes common.
Collect a few intact specimens in a small container when safe, or photograph them clearly from above. Record whether they appeared inside or outside, near a window or light, from a wall opening or soil, and after what weather conditions.
Treat the location as evidence
The place where the sign appears can be as important as the sign itself. A tube beside a patio, evidence near plumbing, wings at one window, or repeated activity in one room helps the inspector decide where to look next.
Avoid foggers, broad household sprays, or repairs before identification. They may scatter insects, obscure evidence, or create unnecessary exposure without addressing a subterranean colony.