Trigona amalthea

Systematic position. Trigona amalthea is a species of stingless bee belonging to the order Hymenoptera, family Apidae, and tribe Meliponini. Native to the Neotropics, these insects are widely known for their complex social structure and nest-building habits. Unlike honeybees that primarily focus on nectar collection, Trigona amalthea exhibits distinct behaviors that classify them as significant agricultural pests in certain regions.

Biology and life cycle. These bees form large perennial colonies in cavities, such as hollow trees or even man-made structures. The life cycle follows a holometabolous development pattern: egg, larva, pupa, and adult. The queen is responsible for continuous egg-laying throughout the year. The workers are highly aggressive and forage for various materials, including plant resins, mud, and specific vegetation tissues, which are essential for the maintenance and expansion of the colony.

Damage characteristics. The destructive activity of Trigona amalthea involves the mechanical gnawing of plant parts. They utilize their mandibles to strip the bark from young, succulent stems and damage flower buds. Additionally, they often target developing fruits, causing necrotic lesions that lead to fruit drop or disfigurement. Their presence is often detected by the characteristic scars left on plant surfaces and the high activity of bees around the foliage.

Affected crops and economic importance. This pest targets a wide variety of economic crops, including citrus, coffee, cocoa, and various stone fruits. The economic impact is twofold: direct loss of yield due to fruit damage and physiological stress on the plant, which hampers development. Severe infestations can lead to the stunting of young trees, making them susceptible to secondary infections by pathogens entering through the wounds created by the bees.

Control measures. Managing Trigona amalthea requires a strategy that balances suppression with local ecological considerations. Because they are social insects, targeting the nest is the most effective approach. Recommended practices include:

• Conducting thorough surveillance to locate nest sites near commercial fields.
• Physically removing nests when found in proximity to vulnerable orchards.
• Applying natural repellent barriers, such as neem oil or other plant-based extracts.
• Installing protective netting for young saplings during the most susceptible growth stages.