Glenea relicta

Glenea relicta is a wood-boring beetle species belonging to the family Cerambycidae (longhorn beetles) and the order Coleoptera. As a primary pest, it poses a significant threat to various deciduous tree species in both forest environments and cultivated orchards.

The beetle typically infests trees by selecting suitable hosts for egg-laying. The larvae are the primary damaging stage, as they tunnel directly into the cambium and xylem. This activity disrupts the vascular system, preventing the transport of nutrients and water, which eventually leads to tree decline.

The biological cycle of Glenea relicta consists of the egg, larval, pupal, and adult stages. Depending on climatic conditions, the larval stage may last for one or more seasons. The adults emerge through characteristic circular exit holes to mate and begin a new cycle of infestation.

Visual symptoms of an infestation include bark discoloration, cracking, small exit holes, and the accumulation of frass (larval excrement). Over time, heavily infested branches or trunks may lose structural integrity, leading to significant economic losses in timber or fruit production.

• Routine inspection and removal of infested woody material.
• Application of systemic insecticides during the peak flight period of adults.
• Improving tree vigor through proper irrigation and fertilization.
• Implementation of biological control agents and preservation of natural predators.
• Monitoring pest activity using trap logs or pheromone-based lures.