Species Profile
Pavement ants (Tetramorium immigrans) are the small dark ants that turn up in Ontario kitchens, especially in spring. They nest under driveways, sidewalks, patio stones, and concrete slabs. Eliminating them means baiting the colony, not spraying the foragers.
The common name describes the typical nest location: under flat hard surfaces that warm up in the sun and provide stable temperature for the brood. Driveways, sidewalks, patio stones, and concrete slabs are perfect. Pavement ants exploit any small crack or expansion joint as a colony entrance. The small ant hills of fine sand that appear between paver joints in summer are pavement ant excavation; the workers push subsurface soil up through the joint.
Pavement ant colonies are outdoors. Workers forage indoors when an attractive food source is available and there is an entry route. Common entry routes:
The classic pattern is a kitchen invasion in May or June. Soil temperatures rise, the colony's foraging activity ramps up, and a worker discovers a food source indoors (a small spill, a crumb, pet food, anything sweet or greasy). Recruitment is fast: within hours of the first scout returning to the colony, dozens of workers follow the pheromone trail back to the food. By the time you notice "ants in the kitchen," there may already be hundreds of trips happening.
The instinct is to spray. Spraying kills the visible foragers, but it also breaks the trail and can cause the colony to send new scouts along different routes, finding new entry points. Within a week the problem is back in a slightly different spot.
Pavement ants are well-suited to bait management. Slow-acting commercial baits (gel formulations indoors, granular outdoors) placed on active trails get carried back to the colony, fed to the queen, and eliminate the colony over 1 to 3 weeks. The visible activity often increases for the first few days as bait recruits more foragers; this is expected and the worst thing to do is panic and switch to spray.
A residual pyrethroid applied around the foundation, doorways, and known entry points kills foragers crossing the line and disrupts new recruitment. Residual lasts roughly 60 to 90 days. The residual is timed and placed not to interfere with bait uptake.
Sealing the entry points the foragers used (caulk around plumbing penetrations, replacement of damaged door sweeps, sealing of cracks in slabs) prevents the next batch of foragers from finding their way back in. Fixing the indoor food incentive (covering pet food when not in use, cleaning behind appliances, sealing food in containers) reduces the foraging value of your kitchen.
The combination of bait plus perimeter plus source reduction collapses the colony in 1 to 4 weeks and prevents the next colony from establishing. A single treatment in spring usually carries through the rest of the year. Re-treatment the following spring (often paired with the first spider perimeter of the year) prevents the next round.
Why do I have ants in my kitchen every spring?
Soil temperatures rise in May, pavement ant colonies become active, foragers discover an indoor food source (often a small spill behind an appliance), and a recruitment trail establishes. The same pattern repeats every spring unless the colony itself is eliminated. A single thorough spring treatment combining bait and perimeter residual usually breaks the cycle.
How long does ant treatment take to work?
Visible foraging often increases for the first 3 to 7 days as bait recruits more workers, then drops sharply between days 7 and 21 as the bait reaches the queen. Most pavement ant colonies are gone within three weeks. Holding the line and not switching to contact spray during the early "looks worse" phase is the homeowner part of the work.
Are pavement ants dangerous?
No. Pavement ants are not known to transmit human disease, do not damage structural wood, and bite only weakly when handled. They are a sanitation and nuisance issue, not a health issue. The reason to control them is they are unpleasant in a kitchen and the trails grow without intervention.
Can I just block the entry point?
Sometimes, briefly. A determined colony will find the next entry point within days. Eliminating the colony is more durable. Source reduction (sealing cracks, replacing door sweeps) is a useful supporting measure but rarely the primary solution.
Will treatment kill my pollinators?
For a pavement ant treatment focused on the foundation perimeter, no. The application targets the foundation, doorways, and exterior entry points, not flowering plants or lawns. Bait stations are placed where ants find them, not where bees forage.
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