Mesa Homeowners: The Monsoon's Over — Now Walk Your Stem Wall

August 26, 2026 · Grim Reaper Pest Control · AZ OPM Lic. #9796

The monsoon gets the headlines for what it does above ground — the roaches, the mosquitoes, the storm debris. Its quietest gift comes later: weeks of damp soil that let Mesa's subterranean termites do their best construction work of the year. Late August through September is when we find the most fresh mud tubes on East Valley foundations, and the difference between finding one now and finding it next spring is measured in thousands of dollars.

What a mud tube actually is

Subterranean termites live in the soil and eat wood, and the space between those two things — your stem wall — is hostile open ground to them. So they build covered highways: pencil-width tunnels of mud and saliva running vertically from soil to the wood line. A tube on your foundation isn't a warning sign that termites might arrive. It's active infrastructure. They're commuting through it.

Why Mesa, why now

Mesa's combination is hard to beat if you're a termite: one of the Valley's oldest housing stocks (more homes built before modern pre-treatments, more aging original barriers), widespread flood irrigation keeping soil moisture high year-round, and a monsoon that just spent eight weeks pre-softening the ground. We wrote in July about the swarmers that fly after storms — the tubes are what the successful ones build once they've landed and settled in.

The ten-minute stem wall walk

• Walk the full exterior foundation where concrete meets soil. You're scanning for vertical mud lines the width of a pencil — tan, brittle, and usually in shaded or damp stretches first.
• Check behind anything leaning on the house: planters, firewood, stored lumber, the hose reel. Termites love a covered approach.
• Look inside the garage along the stem wall and at the expansion joint — interior tubes are easy to miss behind storage.
• Don't knock tubes down. Found one? Leave it and call. An intact tube tells a professional where the colony is working; a scraped-off tube tells them where it used to be.

If you find one — and if you don't

Finding a tube in August is genuinely good news in disguise: subterranean termites work slowly, and a colony caught at the tube stage has usually done trivial damage. Our termite inspections are free, and treatment at this stage is straightforward. If you find nothing, that's a baseline worth having — you now know what clean looks like, and the walk takes ten minutes every fall.

Either way, the soil under Mesa is busiest right now. Request your free termite inspection or call (480) 666-5559 — we'll read the stem wall with you.