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Brown Field Ant

The brown field ant nests outdoors in soil, lawns and under slabs, but enters homes seeking sweet food. Very common in Quebec during summer.

Brown Field Ant

Identification sheet

Appearance
Small light- to dark-brown ant with a uniform body. Often seen in long trails along baseboards and counters.
Size
3 to 5 mm
Color
Light to dark brown
Habitat
Outdoor nests in soil, under slabs, sidewalks and stones. Enters homes through cracks to forage.
Lifespan
Queens: several years; workers: a few months
Danger level
Low

Health risks

The brown field ant doesn't sting and poses no direct health risk. However, it can contaminate food and signal a large nearby nest.

Signs of infestation

  • Long ant trails along walls and counters
  • Small dirt mounds in the lawn or between slabs
  • Ants attracted to sweet foods
  • Increased activity in hot dry weather
  • Visible entry points near windows and doors

Prevention tips

  • Store sweet foods in airtight containers
  • Clean crumbs and residue quickly
  • Seal cracks and entry points
  • Eliminate aphids (honeydew source) on plants
  • Keep mulch and soil away from the house perimeter

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