Oak splendour beetle

Systematic position: The oak splendour beetle (Agrilus arcuatus) belongs to the order Coleoptera and the family Buprestidae. It is a significant forest pest that primarily targets oak species, causing severe damage to the vascular system of trees and often leading to their eventual mortality if left unmanaged.

Host plants: The primary host plants for Agrilus arcuatus are various species of the genus Quercus (oaks). The beetle prefers young trees and stands, where the larvae feed on the cambium and phloem beneath the bark, disrupting the nutrient transport within the tree structure.

Biology and life cycle: The life cycle is typically completed within one year. The larvae overwinter in chambers excavated in the wood or under the bark. Pupation occurs in the spring, and adult beetles emerge in late spring or early summer. After emergence, adults engage in maturation feeding on oak leaves before mating and ovipositing on the bark.

Damage and harmfulness: The main damage is caused by the larval stage. Larvae bore winding, irregular galleries under the bark, which effectively girdle the tree and interrupt the flow of water and nutrients. Chronic infestation causes crown thinning, branch dieback, and eventually renders the tree highly susceptible to secondary pests and pathogens.

Control measures:

• Timely removal and destruction of infested trees during the winter period.
• Regular silvicultural monitoring to detect early signs of infestation in the stand.
• Promoting forest health through proper spacing and thinning to reduce tree stress.
• Encouraging natural predators and parasitoids that target the larval stages.
• Implementing pheromone traps for monitoring adult beetle populations in high-risk areas.