Identification
Dark brown-black with bluish sheen; legs and antennae unusually long relative to the body, diagnostic from across a room. The 12-segmented antenna has no club and the scape (first segment) is nearly twice the head length. Runs in erratic zig-zag patterns rather than tidy trails.
Biology & Colony Structure
Per Texas A&M: colonies hold up to ~2,000 workers and many queens; new colonies form by budding. Highly mobile, entire colonies relocate among rotten wood, mulch, potted plants, wall voids, and heated indoor sites in response to disturbance, weather, or food supply. Cosmopolitan distribution is driven by shipping and the indoor heated environment.
Pest Status & Significance
Significant nuisance in commercial kitchens, hospitals, food plants, and warehouses; less of a stinger or structural problem than a sheer-numbers problem. Can disrupt sensitive medical environments similarly to (but less severely than) Pharaoh ant.
Longhorn Crazy Ant Control Strategy
Bait-first program, protein and sweet baits in rotation, deployed at every trail and harborage. Inspect potted plants and shipping containers for travelling colonies. Use non-repellent perimeter band outdoors in the Gulf.
Recommended Baits & Active Ingredients
Product names are representative of the active-ingredient class and intended for licensed PMPs. Always read and follow the label; rates, sites, and restrictions vary by formulation and state registration.
| Product | Active | Form | Use |
|---|---|---|---|
| Advion Ant Gel | Indoxacarb 0.05% | Gel | Primary indoor tool; high acceptance on protein matrix. |
| Maxforce FC Ant Bait Stations | Fipronil 0.01% | Solid station | Long-term placements in voids and along trails. |
| Optigard Ant Gel | Thiamethoxam 0.010% | Gel | Rotate with indoxacarb to manage bait fatigue. |
| Termidor SC | Fipronil 9.1% | Spray | Non-repellent perimeter in Gulf and Florida outdoor populations. |