Blood-red ant

Taxonomic position of this species places it in the order Hymenoptera, family Formicidae. Formica sanguinea, commonly referred to as the blood-red ant or slave-making ant, is a distinct species known for its parasitic nesting habits, where it raids other ant colonies to capture pupae for its own workforce.

In agronomy, this ant is categorized as an indirect pest. While it does not consume plant tissues directly, it acts as a primary protector of hemipteran pests, such as aphids and scale insects, which are major threats to fruit trees, berries, and various ornamental plants.

Biology and life cycle involve a complex queen-based social hierarchy. The colony is established when a queen invades a host nest and secures her dominance. The life cycle progresses through egg, larval, and pupal stages, with workers focusing on territory expansion and the protection of their symbiotic partners, the aphids, from natural predators.

Nature of damage and harmfulness are directly linked to the symbiosis with sap-sucking insects. By guarding aphids from ladybirds and lacewings, the ants facilitate massive population explosions of these pests. This causes significant plant stress, stunted growth, leaf curling, and the development of sooty mold on the honeydew deposits left by the aphids.

Protection measures include a strategic approach to reduce ant activity in the garden:

• Apply sticky glue bands around tree trunks to disrupt the ants' access to the canopy.
• Implement rigorous aphid control programs using organic soaps or targeted insecticides.
• Utilize baits containing boric acid or slow-acting insecticides to eliminate the colony at its source.
• Regular cultivation of the soil around plants to disturb nesting sites and deter the establishment of new colonies.