Hornbeam jewel beetle

The hornbeam jewel beetle (Agrilus carpini) is a destructive wood-boring insect belonging to the order Coleoptera and the family Buprestidae. This pest primarily targets the trunks and branches of deciduous trees, posing a significant threat to forestry and urban landscaping.

The primary host plants for this species include hornbeam, as well as various types of hazel (filberts), alder, and occasionally birch. While the beetle often attacks stressed or weakened trees, high populations can also lead to infestations in otherwise healthy specimens.

The biology of the beetle is characterized by a life cycle spent predominantly within the wood. The female oviposits on the bark, and upon hatching, the larvae tunnel into the cambium layer. Depending on regional climatic conditions and host health, the full life cycle usually spans one to two years.

Damage is caused by the larvae feeding under the bark, creating meandering galleries that disrupt nutrient and water transport. This leads to branch dieback, crown thinning, and, in severe cases, the death of the tree. External signs include necrotic bark patches and characteristic D-shaped exit holes created by emerging adults.

Control measures primarily involve integrated management strategies:

• Sanitary pruning and removal of infested wood to reduce population density.
• Regular health monitoring of host trees to detect early signs of infestation.
• Maintaining high tree vigor through proper irrigation and soil management.
• Use of pheromone traps to monitor adult flight periods and reduce mating success.