3-4 mm – Dark brown
Insect – Moderate risk
Pavement ant
Also known as the sand ant or sidewalk ant, the cobblestone ant is very common in Quebec. They nest between cobblestones, but enter houses in search of food.
§1Distinctive features
How to identify it
The cobblestone ant measures 3 to 4 mm (workers) and up to 8 mm for the queen. Dark brown body with parallel grooves on the head and thorax, and two small pointed bumps at the base of the thorax. Native to Europe, it is very active in Quebec from spring onwards.
§2Habitat
Where to find it
Its nest can be found between paving stones, in garden paths or under stones. It enters homes in search of food – especially around garbage cans and in warm, damp spaces such as kitchens and basements.
§3Reproduction
Lifecycle
Without intervention, an infestation can double in size in just a few weeks.
§4What to look out for
Signs of infestation
- Ants moving in visible rows
- Small mounds of earth between the cobblestones
- Invasion in food and around garbage cans
- Black spots on walls (droppings)
§5Why act fast
Risks
- Invasion of the house in search of food
- Food contamination
- Colonies of up to 50,000 workers (polygynous)
- Difficult to eliminate completely in summer
§6Prevention
How to avoid it
- Avoid accumulating wood or stones near the house
- Filling cracks in foundations, windows and doors
- Controlling humidity and water infiltration
- Store food in airtight containers
- Close garbage cans tightly
§7Pro method
How MW works
Inspection
Home location and assessment.
Preparation
Customized plan – pre-intervention measurements.
Treatment
Locate main and satellite nests, treat with non-repellent baits.
Follow-up
Inspection visit – written guarantee.
§8We answer you
Frequently asked questions
What distinguishes an ant from cobblestones?
It measures 3-4 mm, is dark brown with parallel grooves on the head. Its nest is characteristic: between paving stones and sidewalks.
Is it dangerous?
It is not dangerous to humans, but can invade food on a massive scale.
How to eliminate it?
Professional treatment recommended for large colonies. Prevention by caulking and feed management.
React quickly, sleep well.
The longer the infestation lasts, the more expensive it becomes.