Olive-black jewel beetle

The olive-black jewel beetle (Agrilus olivaceoniger) is a member of the Buprestidae family within the order Coleoptera. As a wood-boring insect, it is a significant concern for arborists and orchard managers, as its larvae primarily target the vascular tissue of host trees, leading to severe physiological stress.

This beetle species typically infests a variety of broad-leaved trees. In an agricultural context, it is known to impact fruit-bearing species and various ornamental trees in urban landscapes. The insect shows a preference for trees that are already suffering from environmental stress, drought, or poor soil conditions, though healthy trees can also be colonized under high population pressure.

The biological development of this pest is characterized by a multi-stage life cycle. Adult beetles are active during the warmer months, feeding on foliage. After mating, females deposit eggs onto the bark surface. Upon hatching, the larvae immediately bore into the bark, constructing elaborate galleries in the cambium layer. This activity disrupts the translocation of water and nutrients throughout the tree.

The damage caused by Agrilus olivaceoniger is primarily found beneath the bark, where larvae create winding galleries packed with frass. Visually, the impact is seen as crown dieback, leaf chlorosis, and, in severe infestations, vertical cracks in the bark. If left unmanaged, the cumulative damage can weaken the tree to the point of structural failure or death.

Managing this pest requires an integrated approach that emphasizes prevention and early intervention:

• Routine inspection of trees for signs of wood-boring activity or bark damage.
• Prompt removal and disposal of infested wood through burning or chipping to eliminate the larval population.
• Application of approved insecticides during the beetle flight period to target adults.
• Implementation of robust irrigation and fertilization schedules to maintain tree vigor and resistance against colonization.