Solenopsis invicta Buren, know as the red imported fire ant (RIFA) is an invasive species that negatively impact ant diversity. For two years, alpha diversity (á), population dynamics and interactions of ant assemblages with RIFA were studied in a 125 ha pecan orchard in central Texas. The studied focused on investigating the response of ant species when RIFA is treated and reduced with insecticides (granular bait loaded with an insect growth regulator, s-methoprene (IGR), and; a contact insecticide, chlorpyrifos) and the impact these may have on individual species. The insecticide treatments and respective controls were randomly assigned to a 1.33 ha blocks, replicated four times and periodically inspected using pitfall traps, baited vials, manual collections and nest surveys. 16 ant species were found among the treatments. The IGR treatment consistently reduced RIFA while several species were observed to increase as benefited from RIFA reduction. Chlorpyrifos did not have a significant effect in S. invicta but negatively impact other ant species. The pyramid ant, Dorymyrmex flavus McCook, showed the most significant increase in IGR blocks and was found to persist for more than two years after the last IGR treatment. A species turnover is observed indicating the IGR had and adverse affect on RIFA therefore benefiting the ant assemblage.