Amazing documentary showing the use of dogs to help eradicate fire ant colonies. With one of those and some hot water with detergent one could very well get rid of fire ants over a large area with minimum impact and small workforce.

Also in the link below:

Fire ant dogs detection (SPANISH)

Update 25/09/2015

Only now I have read this amazing study describing the use of dogs in locating fire ant colonies!! Kind of sheds light on the matter.

https://www.researchgate.net/publication/50396930_Fire_Ant-Detecting_Canines_A_Complementary_Method_in_Detecting_Red_Imported_Fire_Ants