Two species of fire ants are found in Florida. Most notorious is Solenopsis invicta Buren, the red imported fire ant (RIFA), followed by the much less common Solenopsis geminata (Fabricius), the tropical or native fire ant.
Leaf curl is a plant disease characterized by curling of leaves, and caused by a fungus, genus Taphrina, or virus, especially genus Begomovirus of the family Geminiviridae.
Check to see which leaves (old, new, or all) are rolling, determine the direction of the leaf rolling, and whether any other plant parts, including fruit, are showing abnormal symptoms. Therefore, if symptoms are not determined to be a result of virus or herbicide, the cause could be physiological.