Red harvester ant

Systematic position: Pogonomyrmex barbatus is classified within the order Hymenoptera, family Formicidae, and subfamily Myrmicinae. It is one of the most recognized species of harvester ants due to its significant impact on local ecosystems and agricultural landscapes in North America.

Crops damaged: This species primarily acts as a seed predator. It poses a significant threat to various cereal crops, including wheat, sorghum, and millet. By foraging specifically for seeds, these ants can reduce the crop stand density immediately after sowing, causing economic losses for farmers.

Biology and life cycle: The colonies of Pogonomyrmex barbatus are highly organized, featuring deep underground nests and surface clearing activities. Their life cycle consists of egg, larval, pupal, and adult stages. The colony relies heavily on stored seeds, which are collected during periods of high activity and stored in underground chambers for long-term survival.

Nature of damage and pest significance: The primary form of damage is the mass collection of sown seeds. A distinct sign of their presence is the formation of large, bare circular areas around the colony entrance where vegetation is completely suppressed. In areas with high nest density, the impact on seedling emergence can lead to the necessity of partial or complete field replanting.

Management strategies: Effective control requires a combination of strategies to minimize crop loss:

• Deployment of poisoned baits tailored to the foraging preferences of the species.
• Application of targeted insecticide treatments directly into the nest entrances.
• Mechanical disruption of mound structures to destabilize the colony.
• Seed treatments with repellents to reduce the attractiveness of sown grain to foraging workers.