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Argentine ants (Linepithema humile) are an invasive species found throughout Florida. They form massive multi-queen super-colonies that displace native ant species. Here is the identification and treatment guide.
How to identify Argentine ants
- Tiny — 1/8 inch long.
- Dull brown color.
- Move in distinct trails (very organized).
- No noticeable odor when crushed (unlike odorous house ants).
- Form multiple-queen colonies that grow into super-colonies.
Why they are difficult
Argentine ant super-colonies can have thousands of queens and millions of workers. Killing one queen does not destabilize the colony. Splitting the colony with insecticide spray often makes the problem worse.
Treatment strategy
Step 1: Bait, do not spray
Use sweet liquid bait (Terro) along trails. Workers carry bait back to feed all queens.
Step 2: Multiple bait stations
Place 8-12 bait stations around exterior perimeter and at trail entry points indoors.
Step 3: Persist for 4-6 weeks
Argentine ant elimination takes longer than other species due to colony size. Keep baits stocked.
Step 4: Outdoor perimeter management
Trim landscaping back from foundation. Eliminate aphid-producing plants (aphids are Argentine ant food source).
Verdict
Argentine ants require persistent bait-based treatment over 4-6 weeks. Spraying makes infestation worse by splitting colonies. Patience and consistent baiting work.
Reminder: Always read product labels and follow safety instructions.