Ash bark beetle

Systematic position: The ash bark beetle (Hylesinus aculeatus) is a member of the Coleoptera order, Curculionidae family, and Scolytinae subfamily. This beetle is a specialized pest primarily targeting ash trees (Fraxinus species) and is a known contributor to the decline of ash populations.

Host plants and damage symptoms: The pest primarily affects the common ash. Adults bore into the bark of weakened or stressed trees, creating horizontal egg-laying galleries. Larvae then bore through the cambium and inner bark, disrupting nutrient transport and eventually causing branch dieback or tree mortality.

Biology and life cycle: The beetle overwinters as an adult within the bark or leaf litter. In the spring, they emerge, feed briefly, and mate. Females bore into the tree to deposit eggs, and the resulting larvae feed beneath the bark throughout the summer. The new generation of adults typically emerges by late summer to prepare for overwintering.

Economic and environmental impact: The pest can cause significant damage in parks, urban areas, and forestry plantations. By girdling the tree through their tunneling activity, these beetles prevent the flow of water and nutrients, which is especially lethal to trees already suffering from drought or fungal diseases.

Control measures: Effective management of Hylesinus aculeatus involves several key strategies:

• Rigorous sanitation, including the prompt removal and destruction of infested wood.
• Application of insecticides during the adult flight period to prevent new infestations.
• Improving tree vigor through adequate irrigation and fertilization.
• Monitoring pest activity using pheromone traps to time management actions.
• Avoiding mechanical injuries to the trunks, which serve as entry points for the beetles.