Two-spined dolichoderus ant

Systematic position: Dolichoderus bispinosus belongs to the order Hymenoptera, family Formicidae. It is a prominent tropical ant species often found in agricultural settings, specifically within plantations in Central and South America, where it plays a dual role in the ecosystem.

Target crops and damage: The primary host plant for this species is the cocoa tree (Theobroma cacao). The ant itself does not directly consume significant amounts of plant tissue, but its impact is severe due to its obligate mutualism with sap-sucking insects, which are major agricultural pests.

Biology and life cycle: The species exhibits a social structure with polygyne colonies, allowing for rapid population growth and expansion. They build complex nests using a mixture of soil and plant fiber, usually located on tree branches. These structures provide protection for the colony and serve as hubs for their foraging activities.

Pest profile: The primary harm is caused by the ant's protection of mealybugs and scale insects. By defending these pests from natural predators and parasitoids, the ants enable an unchecked increase in sap-sucking insect populations. This leads to severe physiological stress on the host plant and the proliferation of sooty mold on the foliage.

Control measures: Effective management requires integrating mechanical and chemical strategies.

• Regular pruning of interlocking branches to disrupt foraging paths.
• Application of persistent insecticides to nest sites.
• Introduction of biological control agents that target the mealybugs, thereby breaking the mutualistic relationship.