Pest Control Tips · Vista, CA
Drywood vs. Subterranean Termites: How to Tell Which One You Have
The quickest way to tell drywood from subterranean termites is what they leave behind: drywood termites push out small, hard, pellet-like droppings, while subterranean termites build pencil-width mud tubes and leave soil-packed damage. Drywood termites live entirely inside the wood they eat, while subterranean termites nest in the soil and travel up into your home.
Signs of Drywood Termites
- Small piles of tiny, hard pellets (frass) that look like sand or ground pepper below wood trim, window sills, or attic framing
- Tiny round “kick-out” holes in wood where the termites push pellets out
- Wood that sounds hollow or crumbles, often in attics, eaves, furniture, and trim
- Swarmers or discarded wings near windows on warm, sunny days in late summer and fall
Because drywood termites need no contact with soil, they can show up anywhere in a structure, including upper floors and attics.
Signs of Subterranean Termites
- Mud tubes running up foundation walls, piers, or inside the garage
- Damaged wood with layers eaten along the grain and packed with soil or mud
- Damage close to the ground: sill plates, baseboards, door frames, and wood touching soil
- Swarmers emerging from the ground or cracks in a slab, often after rain
Subterranean termites need moisture, so leaks, irrigation hitting walls, and wood-to-soil contact all raise the risk.
Why the Difference Changes Treatment
Drywood termites are treated where they live in the wood. Small, contained infestations may be handled with localized treatments applied directly into the infested wood, while widespread infestations throughout a structure may call for whole-structure treatment such as fumigation. Subterranean termites are treated at the soil, with liquid treatments that create a protective zone around the foundation or with baiting systems, plus fixing the moisture problems that draw them in.
Treating for the wrong type wastes money and leaves the real colony untouched, which is why accurate identification comes first.
Which Is More Common in Vista?
Both are common in North County San Diego. Drywood termites do well in our mild, coastal-influenced climate and often show up in attics, eaves, and trim, while subterranean termites work up from irrigated soil around foundations. Many homes eventually deal with both, which is why a full inspection looks from the attic down to the soil line.
Other Problems That Look Like Termite Damage
- Wood-boring beetles — Small round exit holes and very fine, powdery dust rather than pellets
- Carpenter ants — Coarse, sawdust-like debris and smooth, clean galleries in damp wood
- Fungus or dry rot — Cracked, brittle, or discolored wood, usually where moisture is present
- Water damage — Soft, stained, or swollen wood near leaks, often without any insects at all
A professional inspection sorts these out quickly, since each one calls for a different fix — and some, like fungus damage, are really moisture problems that need repair more than pest treatment.
Found winged insects around a window? Learn how to tell them apart in Termite Swarmers in San Diego County: Swarmers vs. Flying Ants.
Quick Answers
Are termite pellets the same as sawdust?
No. Drywood termite pellets are hard, oval, and uniform in size, with tiny ridges. Sawdust is fibrous and irregular and usually comes from carpenter ants, wood-boring beetles, or construction.
Can I treat termites myself?
Store-bought products rarely reach an entire colony. Because drywood and subterranean termites need different treatments, a professional inspection is the best way to confirm the type and extent before treating.
Can termites come back after treatment?
They can, especially if the conditions that attracted them — moisture, wood-to-soil contact, or untreated areas — remain. Periodic inspections and fixing those conditions help keep new colonies from moving in.
Found pellets or mud tubes? Call us at (760) 914-9720 — we’re available 24/7 — or learn more about our termite control service.
