http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2009/05/13/national/a062256D48.DTL
Only ant zombies though. At least they don't go around wanting to eat brains.
Lol quotes(put them all together, then lol):
The biting, territorial fire ants cost the Texas economy about $1 billion annually by damaging electrical equipment
About a month after the egg is laid, the ant's head falls off
But it will take time to determine if the flies are effective in Texas, perhaps as long as a decade.
About 10 years should save them an estimate of -$1,000,000,000