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Subterranean termites: how to identify them and what to do
You may have noticed a pencil-like mud tube on a stem wall, a blistered strip of wood, or winged insects near a window. This page helps you tell subterranean termites from ants, drywood termites, and harmless desert termites in Arizona.
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- Mud tubes on foundation or walls
- Blistered or dark sunken wood
- Winged termites indoors
- Equal wings shed near windows
- Live termites inside broken tubes
Subterranean termites nest in soil, then enter homes through soil contact or mud tubes. They are a property pest, since some Arizona species can damage structural wood over time. Take clear photos, avoid disturbing every tube, then have a local pest control company inspect if the signs are on or inside the structure.
Subterranean termites live below the soil surface. Around a house, they may move into wood that touches soil, or they may build mud tubes up a foundation, block wall, pier, or utility entry point. Those tubes help protect their soft bodies from drying out in desert air.
They prefer moist or dead wood, yet Arizona sources report that they can also feed on dry, sound wood. They may tunnel through drywall, plaster, foam insulation, asphalt, and thin metal sheets while trying to reach food. In damaged wood, their galleries often run with the grain.
Finding one tube outside does not tell you how far they have gone. A broken tube that shows live termites is a stronger sign of current activity. Winged termites indoors are also worth taking seriously, since many people first learn they have termites when swarmers or damage appear.
Not every termite tube in Arizona points to a structural pest. Desert termites are common in the Southwest and can make obvious tubes on soil, plants, or walls outdoors. If the tubes are tied to the house, slab, posts, or interior wood, get the area checked.
- Cream-colored workers with rounded heads
- Soldiers with darker heads and jaws
- Straight antennae on winged adults
- Four wings about equal size
- A broad waist with no pinch
- Damage that follows the wood grain
Damages property
Subterranean termites are mainly a risk to wood, paper, cardboard, fabric, and other cellulose materials. People and pets usually aren't the concern. Damage can be hard to see until mud tubes, swarms, or wood changes show up.
Warm temperatures and moisture can raise subterranean termite activity in the Phoenix area. Heavy rain, plumbing leaks, water heater leaks, or irrigation pooling near a slab can make nearby wood more vulnerable.
What's different in the Phoenix area
Phoenix homes often sit on slab foundations built into former desert habitat, where native subterranean termite colonies can already be present. In the Valley, small changes around the slab matter: drip irrigation too close to concrete, flower beds against the stem wall, dense shrubs, wood accents touching soil, or cool-deck paths poured tight to the foundation can create entry routes or disturb a prior barrier.
Often confused with
What you can do today
Photograph the evidence
Take close photos of mud tubes, wings, damaged wood, or insects. Add one wider photo that shows where the sign sits on the house.
Leave some tubes in place
Don't scrape everything away before an inspection. If you open a small section and see live termites, photograph it, then stop disturbing the area.
Check for moisture
Look for plumbing leaks, water heater leaks, wet soil near the slab, and irrigation spraying or pooling at the foundation. Fixing moisture does not remove an established colony, but it reduces a condition termites use.
Remove soil bridges
Move firewood, cardboard, stored lumber, and construction debris away from walls. Check for wood posts, vines, or dense shrubs that connect soil to the house.
Compare wings and bodies
If you found swarmers, look at the antennae, waist, and wing size. Termites have straight antennae, a broad waist, and four wings that are about the same size.
When to call a pest control company
Call a local pest control company if you see mud tubes on the foundation or inside the home, winged termites indoors, live termites in a broken tube, or wood that looks blistered or sunken. A technician will look for entry points, moisture sources, soil-to-wood contact, damaged wood, and signs that separate subterranean termites from drywood termites or ants. Established termite work calls for training and equipment, since the colony is tied to soil and may be hidden.
Not sure what you're dealing with?
Describe it on the phone. The company on the other end handles these calls every day and will know what to ask.
Common questions about subterranean termites in Phoenix
Are subterranean termites common in Arizona?
Yes. University of Arizona Extension describes subterranean termites as a major urban pest group in Arizona, with several species in the desert Southwest. Some are structural pests, while desert termites outdoors may be harmless recyclers.
Are mud tubes always a sign of home damage?
Mud tubes on a foundation, wall, pier, or inside the home should be checked. Large outdoor tubes over open ground, plants, or walls may come from desert termites that are not expected to damage structures.
Do subterranean termites leave termite droppings?
Subterranean termites are more often noticed by mud tubes, swarms, or wood damage. Drywood and dampwood termites are the groups linked with visible pellet piles, so pellet piles point to a different termite check.
Can I just scrape off the mud tubes?
Scraping removes a sign, not the colony in the soil. Take photos first, leave some evidence for a technician, and focus on finding moisture or soil-to-wood contact.
How can I tell termite swarmers from flying ants?
Termite swarmers have straight antennae, a broad waist, and four wings of similar size. Flying ants have bent antennae, a pinched waist, and rear wings that are smaller than the front wings.
Get the subterranean termites problem looked at
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