Pest Alert – Formica Ants
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Formica ant species makes mounds of different types. The one I’m getting calls about creates a flat mound in turf and landscape areas.
Field ants do not have a stinger, but instead they possess a circlet of hairs around an opening at the tip of their abdomen where formic acid is expelled as a defense mechanism. They may pinch skin with their mouthparts, and then squirt formic acid into the wound, which may feel like being stung.
They are found around structures, but do not often invade homes. They often nest in soil, but nests also may be found under lawn and wood debris such as stacks of firewood, bricks, stepping stones, potted plants, and other protected places. They may also be found nesting in foundation voids.
If control is necessary, try following workers back to their nest site. Once the nest is located, a mound drench with an appropriately labeled insecticide is an option. Or granular bait can be applied around the mound.
If ants are entering structures, a thorough perimeter treatment up and along the foundation wall an appropriate insecticide may be necessary. Treat around doorways and windows, and underneath siding.
In addition, make sure all potential entry points are sealed, especially where electrical and utility lines enter buildings. Any vegetation in contact with the foundation should be trimmed back, if possible. Reduce or eliminate sources of moisture around the structure, and store firewood, piles of lumber, and other such items away from the foundation.”
