The answer to tough ant and fire ant problems, Probait is a fast-acting bait that starts killing immediately after ingestion.

Probait Formulation for Professionals is the answer to tough 
ant problems. Probait is a highly effective ant bait containing 0.73% 
Hydramethylnon. Probait starts to kill ants immediately after ingestion.
 Worker ants are attracted to the bait and carry it back into the mound 
as food for the colony, thus killing the queen.

Controls imported and native fire ants, plus harvester, bigheaded and
 Argentine ants. Contains 0.73% Hydramethylnon for fast results.