The Western Harvester Ant (Pogonomyrmex occidentalis) is reddish-brown and typically measures ¼–½ inch. The western harvester ant (Pogonomyrmex occidentalis) ranges across the western United States and is common in Arizona's higher-elevation grasslands and open desert. Workers are reddish-brown with a c.

The Western Harvester Ant poses a moderate risk. Painful sting with potent venom; rated highly on the Schmidt Sting Pain Index. Stings cause intense burning pain, swelling, and potential allergic reactions. Pets and barefoot children are at particular risk.

In Arizona, western harvester ants are most often encountered in the following situations: Dome-shaped gravel mounds in open areas. Reddish-brown ants on seed-foraging trails. Cleared bare soil around the mound entrance.

The Western Harvester Ant is most active during: Spring through fall; most active in warm months. 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.

Treat mounds early in spring before colonies expand. Avoid disturbing mounds. Keep play areas and high-traffic zones clear of active nests.

Granular bait and liquid drench treatments applied to active mounds. Professional treatment recommended for large or multiple colonies.

Most store-bought ant sprays kill only the workers you see, while the queen and colony remain protected underground. Effective Western Harvester 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.