Harvester ant perpilosa

Systematic position. The ant Formica perpilosa (currently classified as Dorymyrmex perpilosa) belongs to the order Hymenoptera and the family Formicidae. These ants are known for their resilience and are often found in arid and semi-arid environments where they interact with various agricultural crops.

Crops affected. The species can cause damage to a wide range of crops, including grains, vegetables, and fruit tree seedlings. They are particularly problematic during the germination phase of seeds, where they may harvest or damage the seeds directly in the soil before they can sprout properly.

Biology and life cycle. This ant undergoes a complete metamorphosis, including egg, larva, pupa, and adult stages. They establish complex colonies in the soil, which are adapted to survive in varying moisture conditions. Their activity levels, foraging behavior, and reproductive success are largely influenced by ambient temperature and ground moisture levels.

Nature of damage and harmfulness. The primary economic impact is due to the destruction of germinating seeds and damage to the root systems of young plants. Furthermore, these ants are known to tend and protect aphids, which are major agricultural pests. This mutualistic relationship leads to increased aphid populations, causing indirect damage through sap-sucking and transmission of viral plant diseases.

Protection measures. Effective control involves a mix of physical and chemical methods:

• Deep tillage of the soil to disturb and destroy ant nests.
• Application of targeted insecticide baits near colony entrances.
• Maintaining field hygiene to reduce food sources for the ants.
• Using barrier protection for tree trunks to prevent upward movement.