Red-headed wood ant

Systematic position: The red-headed wood ant (Formica truncorum) belongs to the order Hymenoptera, family Formicidae. Although naturally forest-dwelling, these ants frequently invade orchards and gardens, establishing foraging territories that often include cultivated fruit trees, shrubs, and ornamental plants.

Biology and lifecycle: This species exhibits typical social behavior, living in colonies with one or more queens. They are known for their territorial behavior and resourcefulness in finding food. The lifecycle is continuous during the warmer months, with workers constantly foraging for sugars to feed the colony and maintain their presence in the surrounding area.

Nature of damage: The primary agricultural problem caused by Formica truncorum is their mutualistic relationship with aphids and scale insects. They actively farm these sucking pests, protecting them from predators and parasites to ensure a steady supply of honeydew. By shielding these pests, the ants cause aphid populations to explode on young vegetation.

Economic impact: The uncontrolled spread of aphids, facilitated by these ants, leads to severe damage, including leaf curling, stunted growth, and the spread of sooty mold on the honeydew deposits. Furthermore, the ants can compromise the root systems of young trees by tunneling through soil, and they occasionally damage ripening fruit by feeding on the sugary pulp.

Control measures: Effective management of red-headed wood ants requires a multi-faceted approach to limit their access and suppress their populations:

• Applying sticky barriers (tree bands) to trunk bases to prevent ants from reaching the canopy.
• Using bait stations with slow-acting insecticides that the workers carry back to the queen and larvae.
• Implementing strict aphid control protocols to eliminate the ants' primary food source.
• Monitoring the garden for early signs of nest building and using physical disruption or targeted treatments in infested areas.