Black house ant

Taxonomic position: Ochetellus glaber, commonly known as the black house ant, belongs to the order Hymenoptera and the family Formicidae. It is an invasive species of ant that has successfully established itself in various environments globally, often becoming a significant nuisance in both urban landscapes and agricultural settings due to its high reproductive rate.

Affected crops and damage: The primary agricultural harm caused by Ochetellus glaber is indirect but severe. These ants act as mutualists for hemipteran pests, including aphids, mealybugs, and scale insects. By protecting these pests from predators and parasites, the ants facilitate high infestation levels on various crops, leading to stunted growth, wilting, and the growth of sooty mold on the honeydew deposits left on leaves.

Biology and lifecycle: The lifecycle of Ochetellus glaber is characterized by polygyny, allowing colonies to expand rapidly through the presence of multiple queens. They are highly active foragers that establish well-defined chemical trails. Their ability to nest in a variety of locations, including soil, wall voids, and decaying wood, makes them extremely resilient and difficult to eradicate once a colony is fully established.

They are particularly attracted to areas where aphids are present, as they rely heavily on honeydew as a major energy source. Their foraging activity increases significantly in warm weather, leading to frequent invasions of nearby plants and structures. Due to their competitive nature, they often outcompete native ant populations, further increasing their impact on the local ecosystem.

Control measures: Management of Ochetellus glaber focuses on reducing the presence of honeydew-producing insects and disrupting ant movement. Effective strategies include:

• Applying systemic insecticides to control aphid and scale populations on host plants.
• Utilizing sticky barriers on tree trunks to prevent ants from accessing foliage.
• Deploying toxicant-based bait stations that target the colony's foraging cycle.
• Removing debris, rotting wood, and other nesting sites around the garden to deter colonization.