Black Field Ant

The black field ant builds large outdoor nests and can form very populous colonies. It invades patios, walkways and enters homes in summer.

Identification sheet

Appearance

Black or very dark brown ant, slightly larger than the brown field ant. Shiny body.

Size

4 to 8 mm

Color

Black to very dark brown

Habitat

Large nests in soil, under stones, patio slabs and along foundations. Sometimes very large colonies.

Lifespan

Queens: several years

Danger level

Low

Health risks

It poses no major health danger and generally doesn't sting, but a populous colony becomes a significant nuisance and can displace soil under slabs and paving.

Signs of infestation

Large dirt mounds in the yard or between slabs
Heavy trails of black ants outdoors
Sinking slabs or paving (displaced soil)
Ants entering through patio doors and windows
Intense activity in mid-summer

Prevention tips

Destroy outdoor nests before they grow
Seal cracks and slab joints
Eliminate food and water sources
Maintain paving and re-level slabs
Keep a preventive barrier around the perimeter

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