A pencil-thick mud tube climbs a concrete wall from the foundation to the ceiling of the room: this is the signature of the subterranean termite. It cannot live far from moisture, so it keeps a permanent link with the soil and builds these tubes to travel inside them, protected from dry air and enemies.
It is the most damaging type of termite in the world, and this article is part of the termite guide. We explain how to recognize it and how to end the colony.
Habitat: It lives in underground colonies and climbs into the building through mud tunnels it builds to protect itself from drying out.
Entry: Through foundation cracks, expansion joints and around pipes that pass through the floor.
The clearest sign: Thin mud tunnels on walls and foundations, and fallen wings near windows after swarming.
The damage: It eats wood and paper from the inside and leaves a thin intact surface, so the damage shows up late.
The rule: Treatment targets the colony underground, not the visible termites, with a chemical barrier or a suitable bait.
How Does It Live?
The parent nest is in the soil, and the colony may extend tens of meters and feed several buildings.
- Contact with the soil: It is essential for it, and without it, it dries out and dies.
- Mud tubes: It builds them from soil, saliva and waste to provide moisture and protection while moving.
- Feeding: On wood and paper, usually starting from the bottom of the building.
- Winged reproductives: They mate after warm rains and found new colonies.
Where Should You Look for It?
Inspection starts at the bottom of the building, where the soil meets wood or concrete.
- Wall foundations: Vertical or horizontal mud tubes.
- Wood touching the ground: Doors, frames, posts and wooden shelves near the floor.
- Around pipes: Where pipes and cables enter the floor.
- Basements and storerooms: Any moisture with stored cardboard.
More details are in signs of termites.
How Do You Treat an Infestation?
The goal is to cut the link between the colony and the building, using a chemical barrier around the building. These are the steps specialists follow:
- Inspection: Identify the entry source, the infested wood and the moisture.
- The chemical barrier: Dig a narrow trench around the foundations and treat the soil, or inject through holes in the concrete floor.
- Wood treatment: Inject the infested wood or spray it locally.
- Removing the tubes: After treatment, and watch for new tubes.
- Follow-up: Inspect every few months in the first year.
For details, see getting rid of termites.
Mistakes to Avoid
- Breaking only the tube: It will be rebuilt within days if the soil is not treated.
- Spraying only the visible wood: The colony in the soil remains.
- Ignoring moisture: Without fixing the leak, the infestation renews.
The Colony Life Cycle
The colony grows slowly at first and then accelerates after several years.
- Founding: A queen and king build a small nest and lay dozens of eggs.
- Growth: Workers and soldiers form and the numbers increase over several years.
- Maturity: The colony produces winged reproductives every year that emerge after rain.
- Expansion: Several satellite colonies connected by tunnels may branch out.
How Do You Tell It from a Winged Ant?
The emergence of winged insects after rain confuses many people, and the difference is clear:
- Waist: Termites have no narrow waist, while ants have a slender waist.
- Antennae: Straight in termites and elbowed in ants.
- Wings: Four wings of equal length in termites, and larger front wings in ants.
Protecting a New Building
- Treat the soil before pouring the concrete.
- Install metal mesh where pipes penetrate.
- Separate the wood from the soil with a concrete base.
- Do a first inspection a year after handover.
Mud Tubes: Types and Meaning
Mud tubes are the clearest sign of subterranean termites. Learn their types to understand where the infestation stands:
- Working tubes: About a finger wide, running along the foundation and walls, they are the workers' passage between the nest and the wood source.
- Exploratory tubes: Thinner and shorter, built by workers searching for new food.
- Drop tubes: They hang from the wood toward the ground to connect the floor to the soil.
Where Does the Infestation Start Inside the House?
The most exposed places are bathrooms, under sinks, around plumbing pipes, laundry rooms and exterior door thresholds. A slow leak or constant moisture makes these spots attractive to the colony because it needs a damp environment that protects it from drying out.
Who Is the Queen and What Is Her Role?
The queen lives in a deep nest underground and lays eggs in large numbers, while the workers gather food and feed everyone. This explains why killing the termites you see does not stop the infestation: the source is hidden in the soil, and effective treatment targets the soil around the building or uses a bait that workers carry to the colony.
Products from the Orkida Store
We choose the treatment according to the type of termite and where the infestation is, and we recommend reading the dose and safety interval on the label before starting. For large infestations, it is better to use a specialist to apply the full barrier.
- Professional Termite Control Package for Homes: A professional termite package combining the specialized insecticide and application equipment, and it is the most suitable starting point for most homes.
- Agenda 25 EC Public Health Insecticide for Termite Control, 1 L: Agenda 25 (fipronil) is a concentrate for treating the soil around foundations, and it is one of the essentials of the chemical barrier that termites pass through, carrying the material into the colony.
- Agenda 25 EC Public Health Insecticide for Termite Control, 100 ml: A small pack of Agenda for spot treatment in a small building or the affected part.
- Premise 200 SC Insecticide for Termite Control, 1 L: Premise (imidacloprid) is non-repellent, so termites do not avoid it. They pass through it and carry its effect to the colony, making it a strong option around foundations.
- Biflex TC Insecticide for Termite Control, 1 L: Biflex (bifenthrin) is a repellent, fast-acting soil barrier at foundations and entrances.
Frequently Asked Questions
How do I tell an old mud tube from an active one?
Break off a small piece and wait a few days. If it is rebuilt, it is active, and if it stays broken, it is probably old.
Does it infest the upper floors?
Yes. It may build tubes inside walls going upward in search of wood.
How long does the treatment last?
The effect of the barrier stays in the soil for years depending on the product and the soil, with periodic inspection.
Do termites harm plants?
They may feed on roots and dead wood, but they rarely harm healthy living trees.
Image source: Hans Hillewaert, Wikimedia Commons (CC BY-SA 4.0)