Beginning around the year 2000 Florida was invaded by this species of aggressive ant, and in 2002 a similar ant showed up in numbers around Houston, Texas. Subsequent studies of these two ants have determined, in 2012, that they are the same species and are the South American species Nylanderia fulva. The previous genus name of Paratrechina, linking it to other native North American crazy ants, was changed to the genus name Nylanderia. The "common" names are a continuing source of argument, with "tawny crazy ant" most recently proposed. These ants form massive colonies of possibly hundreds of thousands of workers and dozens of queens, and wide foraging trails of thousands of fast-moving workers will overwhelm residential properties. They cannot sting and rarely invade structures, but their sheer numbers and aggressive movements create serious pest problems.
Successful control is still under study. The problem is the overwhelming numbers of the ants in an established colony. Insect baits do not seem to be highly acceptable to the ants, although they will accept sweet baits that are replaced quickly and kept fresh, as well as placed directly along their trails. The use of non-repellent contact insecticides, particularly those with a good “transfer effect” within the colony, seems to be providing the best management at this time.