The Crazy Ant (Nylanderia fulva / Paratrechina longicornis) is dark brown to black with long legs and antennae and typically measures ⅛ inch. Crazy ants get their name from their rapid, erratic, non-linear movement — unlike most ants, they do not follow orderly trails. Several species go by this common name in Arizona, including the longhor.

The Crazy Ant is generally low-risk, but caution is still advised. No sting; not medically dangerous. Can damage electronics by nesting inside equipment and causing short circuits. Large-scale home invasions. Difficult to control due to multiple queens and dispersed nesting.

In Arizona, crazy ants are most often encountered in the following situations: Fast-moving ants running in erratic, non-linear patterns. Dense aggregations in moist areas, under debris, or near electronics. No organized trail structure. Nests in diverse locations including wall voids and electrical equipment.

The Crazy Ant is most active during: Year-round; invasions increase during hot, dry weather. Arizona's warm desert climate can extend activity periods compared to other states, so year-round vigilance is recommended in the Phoenix metro and surrounding areas.

Seal entry points. Eliminate moisture sources. Keep electronics and appliances clean and dry. Treat perimeter regularly. Remove leaf litter and debris from around the foundation.

Non-repellent bait and contact insecticide along active foraging areas. Perimeter treatment. Multiple applications typically required.

Most store-bought ant sprays kill only the workers you see, while the queen and colony remain protected underground. Effective Crazy Ant control requires baiting or targeted colony treatments that workers carry back to the nest. Pest Control Bros uses professional-grade products and application methods that address the entire colony.