Coptotermes acinaciformis: a major white ant of Australian houses
A big, hidden colony and a taste for sound timber. Here is what the name means and what it does not let you decide.
What Coptotermes acinaciformis is
Coptotermes acinaciformis is a subterranean termite found across mainland Australia. It belongs to the genus Coptotermes, the group responsible for much of the structural damage to Australian houses. It is one of the species people mean when they say "white ants".
It is not a species you can pick out in your own home. Telling it apart from its close relatives means looking at soldiers under magnification. That is a job for a licensed inspector, not for a torch and a phone.
Why this species has the reputation it has
Three habits explain it. Colonies can grow very large. They eat sound, seasoned timber, not just rotten wood. And they work out of sight, so the damage runs for a long time before anything shows.
The nest is often a long way from the house. It may sit in a living tree, a stump, or in the ground. In some regions the species builds a mound. In others there is nothing to see at all. Foraging workers then travel through the soil to reach timber, sometimes a long way from the nest.
| What you might notice | What it can mean | What it cannot tell you |
|---|---|---|
| Mud tubes on a pier or wall | Subterranean termites are travelling to timber | The species |
| Hollow-sounding skirting board | Timber eaten from the inside | Whether the colony is still active |
| Swarming winged termites | A mature colony is nearby | That it is in your house |
| A nest in a tree or stump | A colony on the property | Which colony is feeding on the building |
Why a name does not change what you do
Say an inspector tells you the culprit is this species. Does that change your next step? Not really. Whatever the species, the job is the same: find the activity, find how the termites got in, and have a licensed technician manage it.
That is why this page is about understanding, not diagnosis. We do not identify termites from photos or descriptions, and nobody else should either. Getting the species wrong can change the treatment.
Where it gets into a house
Subterranean termites need moisture and a hidden path. They tend to enter through ground contact, cracks in a slab, service penetrations, or any spot where a barrier has been bridged. Damp, badly ventilated subfloors help them. Our guide to moisture, subfloors and ventilation covers the conditions to fix.
Gaps between a barrier and a garden bed, stored timber against a wall, and render that runs down to the soil all hand them a way in. None of this is unusual. It is how most houses are found.
What not to do if you suspect it
- Do not break the mud tubes. The workers will seal the damage and may come back by a hidden route. An inspector also reads the tubes as evidence.
- Do not spray the area. A supermarket insecticide reaches a few workers, not the colony. It can push the termites to feed somewhere you cannot see.
- Do not dig into the nest or the timber. Disturbing a colony scatters it and makes it harder to find.
- Do not decide it is "only" a minor species. Hidden activity is judged on the whole property.
What to do instead
Book a timber pest inspection to AS 4349.3 with a licensed inspector. Leave any evidence exactly as you found it. If activity is confirmed, treatment and barriers are applied by a licensed pest management technician using products registered by the APVMA. Ask what they found, where, and how they know it is active.
Our guide to mud tubes shows what the evidence looks like. Then step back and let the inspector read it.
Frequently asked questions
Is Coptotermes acinaciformis the same as a white ant?
It is one kind of white ant. White ant is the everyday Australian name for termites in general, and this species is one of the subterranean ones that attacks houses.
Can I tell if I have Coptotermes acinaciformis?
Not reliably. Species are separated on soldiers under magnification, and one property can hold more than one colony. An inspector can tell you what is active and where.
Should I treat it myself?
No. Sprays and disturbance can scatter the colony and hide the damage. Termiticides are registered by the APVMA and applied by a licensed pest management technician.
Does finding a nest in a tree mean it is attacking my house?
Not necessarily. It means there is a colony on the property. Whether it is feeding on the building is an inspection question.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- Department of Health, Victoria. Pest control, termites
- Queensland Building and Construction Commission. Protect against termites: termite management systems and inspections
- Standards Australia. Australian Standards (AS 3660 termite management, AS 4349.3 timber pest inspection)