The immediately put their house up for sale and moved to Utah.
There are things you can put on your yard but they aren't going to be eradicated on a large scale.
Something interesting:
http://www.chron.com/news/houston-texas/houston/article/Crazy-ants-can-fight-off-fire-ants-new-study-5233643.php
Also:
Phorid flies, or Phoridae, are a large family of small, hump-backed flies somewhat smaller than vinegar flies; two species in this family (Pseudacteon tricuspis and Pseudacteon curvatus) are parasitoids of the red imported fire ant in its native range in South America. Some 110 species of the genus Pseudacteon, or ant-decapitating flies, have been described. Members of Pseudacteon reproduce by laying eggs in the thorax of the ant. The first instar larvae migrates to the head, then develops by feeding on the hemolymph, muscle tissue, and nervous tissue. After about two weeks, they cause the ant’s head to fall off by releasing an enzyme that dissolves the membrane attaching the ant’s head to its body. The fly pupates in the detached head capsule, emerging two weeks later.[13]
Pseudacteon flies appear to be important ecological constraints on Solenopsis species and they have been introduced throughout the southern United States, starting with Travis, Brazos, and Dallas counties in Texas, as well as Mobile, Alabama, where the ants first entered North America
U.S. scientists regularly release several species of phorid flies to control alien fire ants, which have spread across the southern U.S. during the past half century and outcompeted many native ant species.
Now scientists have released a new species of phorid, Pseudacteon obtusus (not pictured), for the first time in the U.S., Texas A&M University announced May 11.
Released in southern Texas in 2008 and eastern Texas in April 2009, P. obtusus is the first phorid released in the U.S. that is known to attack ants as they forage. In theory, feeding ants are more vulnerable to attack than those hunkering down in hidden nests.
The flies—which don’t have a taste for native U.S. ants—also drive the frightened fire ants into their nests, freeing up more food for the indigenous ants.
It’s about “leveling the playing field for native ants. We’re trying to restore the balance,” said Rob Plowes, a research associate at the University of Texas.
http://news.nationalgeographic.com/news/2009/05/photogalleries/zombie-ants/
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And this:
http://texnews.com/1998/texas/fishkill0604.html