Subterranean termites

There is a belief out here that this country is too dry for termites. It is the single most expensive misconception in West Texas property ownership, and it is not supported by any extension source we can find.

It is also self-reinforcing in an unusually damaging way. People who believe there are no termites do not have inspections, do not correct conducive conditions, and do not look at the foundation line — so activity runs undetected for years, and by the time anybody notices, the finding confirms nothing except that nobody was looking.

This is the most useful piece of local knowledge on this page, and it is one that saves people money rather than costing them any.

If you have land out here, you have very likely seen thin sheets and fragile tubes of dried mud on fence posts, on dead grass, on cow dung, on the base of mesquite. It looks alarming and it is routinely mistaken for a structural termite problem.

It is almost certainly the desert termite, Gnathamitermes tubiformans, and AgriLife's description is unambiguous. Common in south and west Texas. Conspicuous from May through September on shortgrass pasture. Builds fragile mud tubes and sheets of mud around the surfaces of herbaceous and woody plants, litter, dung, fence posts and similar objects. Workers about three-eighths of an inch, creamy white with brown heads.

And the three facts that matter: it does not tunnel into wood, it causes no structural damage, and AgriLife describes it as medically harmless to man and animals.

What it actually is is a rangeland forage issue. It feeds on living and dry forage grasses, and it is worse on overgrazed or drought-stressed ground — which makes its presence a grazing-management signal rather than a pest control emergency.

How to tell them apart in practice. Location and material. Desert termite workings are out in the open on vegetation, litter and dung, in pasture, and they are fragile — they crumble at a touch. Subterranean termite shelter tubes are on structures: piers, foundation walls, slab edges, near utility penetrations, running vertically toward wood, and they are tougher and more purposeful. Mud on your fence line is one thing. Mud on your foundation is another.

Why a pest company tells you this. Because the alternative is quoting a termite job on a pasture phenomenon that was never going to hurt anything. That happens, and it should not.

Workers are blind, wingless, white to creamy white, a quarter to three-eighths of an inch. They do all the feeding and all the damage.

Soldiers look like workers but with well-developed brownish heads and strong mandibles. They make up only one to five percent of a colony, which is why finding one is informative — there are a great many workers behind it.

Swarmers — the reproductives — run about a quarter to three-eighths of an inch, coal black through to pale yellow-brown, with pale or smoky-grey wings.

Timing tells you about age. A colony takes two to four years to produce swarmers, and E-368 puts maturity at three to five years. A mature native colony is described as around two hundred and fifty thousand workers, though many are much smaller. So a swarm inside your house is evidence of something established years ago, not something that arrived recently — which is the argument for inspection rather than for waiting to see whether it recurs.

What mud tubes are made of, and why that matters. AgriLife describes shelter tubes as particles of soil or wood and bits of debris held together by salivary and faecal secretions. They serve three purposes: protection while foraging above ground, bridging masonry barriers the termites cannot eat through, and carrying moist soil up into the structure so the colony can work away from the ground. That third function is the one that connects back to the dryness argument — the tube is how they take their humidity with them.

Termite or flying ant? Two checks and they are both easy. A termite has no pinched waist; an ant does. A termite's four wings are equal in length; an ant's front wings are longer than the rear pair. Keep a few in a bag or take a close photograph — identification off a swarmer is straightforward and it settles the question immediately.

On a slab, AgriLife's account is that termites enter through wood in direct contact with soil, and by building shelter tubes over or through cracks in foundations. The specific vulnerabilities are bath traps and utility penetrations — the openings cut through the slab for plumbing, which are frequently oversized and rarely sealed. Removable access hatches at bath traps are recommended, and post-construction treatment often requires drilling.

The problem with a slab is not that it prevents termites. It is that it hides them. Activity can run inside a wall for a long time with nothing visible from the interior, which is why the exterior foundation line and the penetrations matter so much on an inspection.

On pier-and-beam, AgriLife gives construction figures worth knowing: a minimum of eighteen inches of clearance between floor joists and soil, and at least twelve inches between floor beams and soil. Cover at least seventy percent of the crawl space soil with six-mil polyethylene. Cross-ventilate at one square foot of vent per hundred and fifty square feet of crawl space, with vents opposite one another and near the corners.

The advantage of a crawl space is that it can be inspected. The disadvantage is that it usually is not, and a crawl space with poor ventilation and no vapour barrier is a humidity chamber under your floor.

AgriLife's E-368 puts termite damage in Texas at roughly five hundred million dollars a year, and states that an unprotected home has approximately a seventy percent chance of termite damage within twenty-five years.

Those are state-level figures and we are labelling them as such. Texas includes the Gulf coast, where pressure is at its highest and where Formosan termites occur. Applying a statewide percentage to a property in Gaines County as though it were a local risk figure would be exactly the kind of move this site exists not to make.

What the figures are genuinely useful for is the shape of the problem rather than its local magnitude: termite damage is slow, cumulative, and largely invisible until it is substantial, which is why it is measured over twenty-five years rather than in incidents.

And the honest local position is the one this page opened with. We do not know the West Texas number, nobody has published it, the dry-climate reasoning does not hold, and the cost of finding out the hard way is structural. An inspection is cheap by comparison, and if it finds nothing at all, that is a good outcome rather than a wasted visit.

Biology, construction standards and management guidance on this page follow Texas A&M AgriLife Extension publications, principally E-368, together with the Texas Insects field guide and AgriLife urban entomology material. Where a claim could not be sourced for this region, the page says so rather than filling the gap.