Termites are not one bug with one playbook. The type you have decides how the problem gets solved, and the two most common kinds (subterranean and drywood) nest in different places, leave different clues, and respond to different treatments. Get the ID wrong and you can spend money on an approach that never reaches them. So start with the difference.
Quick answer
Subterranean termites live in the soil, need ground contact and moisture, and build mud tubes to reach wood. Drywood termites live entirely inside the dry wood they eat, with no soil contact. That difference is why each type needs a completely different treatment to stop it.
Dealing with this right now?
Seeing mud tubes but not sure if it's subterranean, or finding frass that looks drywood? Have a licensed local pro identify the species first, then match the treatment to what's really in your wood.
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Where each type lives
Moisture is the dividing line. Subterranean termites live in the soil and need contact with the ground to stay alive, so they build mud tubes to travel from their underground colony up into your wood. Those tubes keep them humid the whole trip.
Drywood termites work the other way around. They live entirely inside the dry wood they're eating, with no soil contact and no outside moisture needed. A colony can settle into a beam, a wooden chair, or your attic framing and never touch the ground at all.
Which is more common, and where
Subterranean termites are the more widespread and the more destructive. Their big underground colonies and ground-level access make them a threat across a wide range of climates, and they account for most termite damage in homes.
Drywood termites are less common. They cluster in warm, humid places, including coastal and Gulf areas. And because they don't depend on soil, they can ride into a house tucked inside infested furniture or lumber, which is how they turn up somewhere you'd never expect.
What each one leaves behind
Different lifestyles, different evidence. Spotting the right clue is what points you (and a pro) toward the species in front of you.
Subterranean termites tip their hand with mud tubes and with wood that's been hollowed out and packed with soil. Drywood termites mostly give themselves away through their droppings.
- Subterranean: pencil-width mud tubes running up foundations, piers, and walls
- Subterranean: hollowed wood with a soil-flecked, layered look inside
- Drywood: little piles of pellet-like frass under kick-out holes in the wood
- Both: discarded wings near windows after a swarm, plus wood that sounds hollow when tapped
How the damage differs
Subterranean termites eat along the grain and pull soil and moisture into their galleries, which leaves a damp, dirty honeycomb behind. Big colonies plus constant access from the soil means they can chew through structural wood fast.
Drywood termites are tidier. They carve clean, smooth galleries across the grain and shove the frass out as they go. Smaller colonies, slower growth, damage that builds over years instead of months. It still adds up. A drywood colony that goes unnoticed for a long time can do real harm.
Why the type changes the treatment
This is where the ID stops being trivia. The two types need completely different treatments. Subterranean termites get controlled by cutting off their link to the soil, so liquid soil barriers and in-ground bait systems are the standard tools against them.
Drywood termites live in the wood with no soil connection, which means a soil treatment never reaches them. They call for treatments aimed at the wood itself: spot treatment of infested pieces, or whole-structure fumigation when the infestation is widespread. Treat a drywood problem like a subterranean one, or the reverse, and you've thrown money at termites that keep on eating.
- Subterranean: liquid soil barriers and in-ground bait systems
- Drywood: wood treatments, spot treatment, or whole-structure fumigation
Get the species identified first
Since the treatment paths split so sharply, step one for any termite problem is pinning down the type. The clues overlap more than you'd think (shed wings and hollow wood show up for both), so a confident call usually takes a trained eye.
A licensed local pro can read the evidence, name the species, and match it to a treatment that can reach the colony. Nail the ID up front and the rest of the job has a fighting chance.