So… Why Do Termites Eat Wood?
Wood contains cellulose, which is basically sugar for termites.
They can’t break it down on their own, though. They rely on natural microorganisms in their gut to turn it into usable nutrients.
So when termites chew through wood, they’re really just:
- Extracting food (cellulose)
- Leaving behind hollowed-out damage
That’s why termite damage often goes unnoticed—because they eat wood from the inside out.
Why This Matters for San Diego Residents
San Diego’s climate allows termites to stay active year-round, which is why professional termite control is such an important part of protecting homes in this area.
We regularly see two main types of termites locally:
- Drywood termites: A species that lives directly inside the wood they eat
- Subterranean termites: A type of termite that comes from the soil and travels into structures
Because of this, termite activity isn’t limited to certain seasons or certain types of homes.
Homes we inspect include:
- New builds
- Coastal properties
- Older homes
…and everything in between.
Do Different Termites Eat Different Types of Wood?
Not exactly—but they go after wood in very different ways.
Drywood Termites
Drywood termites don’t need contact with soil. They live entirely inside the wood they’re feeding on.
They’re often found in:
- Attics and roof framing
- Fascia boards and eaves
- Window and door frames
- Wooden furniture
They tend to infest dry, solid wood, which makes them especially common in San Diego homes—and a frequent reason homeowners seek treatment.
Subterranean Termites
Subterranean termites live underground and build pathways into your home.
They’re usually found in:
- Areas near the foundation
- Crawl spaces
- Wood with higher moisture levels
They prefer moist or softened wood, but they’ll travel through soil and other materials to reach it—often going unnoticed along the way.
What This Means for Your Home
Once termites find a food source, they don’t stop.
If your home has:
- Wood
- Moisture (even small amounts)
- Hidden entry points
…it can attract termite activity and the need for professional termite control.
Do Termites Only Eat Structural Wood?
No—and this is where many homeowners are surprised.
Termites will go after:
- Structural framing
- Hardwood floors
- Cabinets and built-ins
- Trim and baseboards
- Wooden furniture
If it contains cellulose, it’s a potential target—and something that may eventually require termite control if left unchecked.
Why You Usually Don’t See Them
Many homeowners assume they’d notice termites right away—but that’s rarely the case.
- Drywood termites stay hidden inside wood
- Subterranean termites travel through mud tubes
- Damage builds quietly over time
By the time visible signs appear, termite activity is often established—making early termite control even more important.
Signs of Termites (And What Type They Point To)
Different termites leave behind different clues. Knowing what to look for can help you catch a problem earlier and avoid more extensive termite control later.
Signs of Drywood Termites
- Small piles of pellet-like droppings (often mistaken for sawdust)
- Tiny holes in wood surfaces
- Damage in isolated areas, like trim or furniture
- Swarmers (winged termites) indoors
Signs of Subterranean Termites
- Mud tubes along foundations, walls, or crawl spaces
- Soft or hollow-sounding wood near the base of your home
- Bubbling or darkened wood surfaces
- Swarmers near windows or light sources
Not Sure Which One You’re Seeing?
Most homeowners aren’t—and that’s completely normal.
At Harbor Pest Control, we provide free termite inspections and proven termite control tailored to:
- The type of termite
- The location of activity
- The extent of the infestation
If you’re seeing signs of termites—or just want peace of mind—schedule a professional inspection with our local team. We’ll walk you through exactly what’s going on and what to do next.
Common Questions Homeowners Ask About Termites
Why does termite-eaten wood look almost perfect from the outside?
Because termites eat wood from the inside out. They hollow out the softer interior while leaving a thin outer layer intact, which helps keep them protected and hidden. As a result, wood can look perfectly fine on the surface while being significantly damaged underneath the surface.
Is termite damage really that serious?
It can be. Termites cause billions of dollars in damage each year, and most homeowners' insurance policies don’t cover it—making termite control a smart investment.
Can I treat termites myself?
DIY methods rarely eliminate the entire colony. Professional termite control is designed to address the source of the problem, not just what you can see.
What to Do If You’re Concerned
Knowing why they eat wood helps—but what really matters is protecting your home.
Because once termites find a food source, they won’t leave without professional treatment.
At Harbor Pest Control, we offer:
- Thorough termite inspections
- Proven termite control solutions
- Local expertise specific to San Diego homes
Schedule your termite inspection today and find out if your home is at risk. Our local technicians will walk you through exactly what’s happening in your home—and what to do next.
The sooner you catch termite activity, the easier (and less expensive) it is to treat.
Get Ahead of Termite Damage
If something prompted you to search this question, it’s worth taking a closer look.
Early termite control can prevent more extensive damage down the road.
Contact Harbor Pest Control today to schedule your inspection and protect your San Diego home with trusted, local termite control.
Originally published on November 4, 2025. Updated March 2026.
