How can I tell if I have fire ants?
You can tell you have fire ants if....
You see a mound of fluffy worked soil, 
particularly
a few days after a heavy rain.
The mound has no opening in the center like most ant mounds. Red imported fire ants leave and enter the mound housing the colony through underground tunnels.
Undisturbed mounds in pastures can reach 18 inches 
in
height, but most mounds in turfgrass areas are usually just a few
inches tall. When you shovel into the colony's mound of soil you
see white objects. This
is the brood - the eggs, larvae and pupae of developing ants.
Fire ants are small, only about 1/8" to 1/4" long. Variation
in size is a distinguishing 
characteristic of imported fire ants. Many other ant species are uniform in size.
When you disturb the mound, dozens to hundreds of reddish-brown worker ants crawl up vertical surfaces (like grasses and other objects) on and around the mound. Few native ants charge up vertical surfaces.
If you get stung it feels like being burned. A day or 
so
later, the imported fire ant's unique venom forms a white
fluid filled pustule or blister at the red sting site that is very
characteristic - only fire ant venom causes this symptom!
Worker ants bite (with mandibles) and sting (with stingers) aggressively and repeatedly.
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