Jewel beetle

Jewel beetles of the genus Agrilus are a large group of insects belonging to the order Coleoptera and the family Buprestidae. These insects are notorious wood-boring pests that cause significant economic and environmental damage to a wide variety of trees and shrubs globally.

These pests target a broad range of hosts, including deciduous trees and fruit crops. High-profile species, such as the emerald ash borer, have caused catastrophic losses in native forests, while other members of the genus frequently attack birches, oaks, roses, and various orchard tree varieties.

The life cycle of the jewel beetle involves complete metamorphosis, consisting of the egg, larva, pupa, and adult stages. While adults feed on foliage, the larvae are the primary damaging stage, excavating meandering galleries beneath the bark that effectively girdle the tree and cut off nutrient transport.

Key indicators of infestation include D-shaped exit holes on the tree trunk and visible winding galleries under the bark. As the infestation progresses, trees exhibit crown dieback, epicormic branching, and thinning foliage, which often leads to the total death of the host tree within a few years.

Management and control strategies are essential for protecting vulnerable populations:

• Removal and destruction of infested trees and wood debris
• Systemic insecticide treatments applied during adult flight periods
• Maintaining high tree vigor through irrigation and fertilization
• Monitoring populations using pheromone or sticky traps
• Strict quarantine regulations for timber movement