Red & Black Ants in Central WI: Not Fire Ants

Central Wisconsin: Black and red ants biting/stinging in landscaping, under rocks, in decomposed wood. Many mounds. Homeowner thinks fire ants, but knows they're southern.

Reality Check

Fire ants don't occur in central WI. Likely species:

• Formica spp. (field ants) – red/black, bite + spray formic acid.
• Myrmica spp. – can sting.
• Carpenter ants (large, but not these).

Control (Any Species)

• Baits: Amdro, Advion, or other granular baits broadcast or at mounds.
• Mound drenches: Liquid insecticide (follow label).
• ID for curiosity: Collect specimens → UW Madison Extension (extension.org).

Why They're There

Suitable habitat: loose soil, food (insects, honeydew), moisture. Not "attracted" by anything specific.

Manage for comfort, not eradication.