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
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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