Nasutitermes costalis

Systematic position: Nasutitermes costalis belongs to the order Isoptera, family Termitidae. These social insects maintain a highly organized colony structure, with specialized castes performing distinct roles, which ensures the survival and expansion of the population within its environment.

Affected crops: This termite species is known for attacking various woody plants, including orchards and forestry plantations. While they prefer decaying wood, they are notorious for aggressive foraging on living trees, which they exploit for both food and protective shelter through their network of mud tubes.

Biology and lifecycle: The colony revolves around the queen, who serves as the primary reproductive unit. The lifecycle involves a gradual metamorphosis from eggs to larvae. The insects construct intricate nests, often located on trees or at ground level, connected by covered galleries that allow them to navigate while remaining protected from direct sunlight and predators.

Nature of damage: The termites hollow out the internal structure of trees, disrupting nutrient and water transport by damaging the cambium layer. This hidden damage often goes unnoticed until the tree shows visible signs of decay, such as yellowing leaves, crown dieback, or structural instability leading to collapse during high winds.

Control measures: Effective management requires an integrated approach:

• Regular inspection of orchards to identify protective mud galleries on bark.
• Application of perimeter treatments using non-repellent termiticides.
• Deployment of baiting systems containing slow-acting growth regulators to eliminate the entire colony.
• Removing infested dead wood and debris from the vicinity of healthy crop trees.