Fire Ant Control in Large Pastures

A landowner wanted to treat 84 acres of pasture for fire ants; dogs are trained there but no livestock. Three pasture-labeled products were identified: methoprene (Extinguish, growth regulator), hydramethylnon (Amdro Pro, slow-acting bait), and spinosad (Justice, nerve toxin from bacteria). Treating the whole area is expensive; the expert suggested declaring an ant-free zone around high-use areas and treating only that.

Long-term hope: a parasitic phorid fly and a natural disease are being researched. The fly has naturalized in North Florida and may spread northward.

Practical Approach:

• Focus on 5–10 acres around kennels, barns, homes.
• Apply bait in spring and fall when ants forage actively.
• Rotate chemistries to prevent resistance.
• Monitor for phorid fly establishment.

Complete eradication on 84 acres is unrealistic; management is the goal.