Ribbed pine borer

Systematic position: The genus Rhagium belongs to the order Coleoptera and the family Cerambycidae (longhorn beetles). These beetles are known for their distinct appearance and their role as significant pests of forest trees and ornamental woody plants.

Host plants: They primarily attack various coniferous species such as pine, spruce, and fir, as well as deciduous trees like oak and birch. They typically infest stressed, dying, or recently felled timber, making them a concern for forestry and wood production industries.

Biology and life cycle: The life cycle of Rhagium typically spans two years. Adults emerge in spring or early summer to feed on foliage or bark. Females lay eggs in bark crevices. Upon hatching, the larvae tunnel into the cambium layer, where they feed extensively. Before pupation, the larvae create distinctive pupal cells or 'cradles' in the wood, often lined with wood fibers.

Damage and economic impact: The damage is primarily caused by larval feeding, which disrupts the transport of water and nutrients, leading to the decline and death of the tree. The structural integrity of the wood is compromised, and the larvae create large galleries that act as entry points for secondary pathogens and wood-decaying fungi.

• Sanitary harvesting of infested and dead wood to reduce the beetle population.
• Debarking logs immediately after felling to kill larvae.
• Use of pheromone-baited traps for monitoring and mass trapping.
• Application of residual contact insecticides during the adult emergence phase.
• Maintaining overall stand health through silvicultural practices and proper irrigation.