<i>Pityogenes chalcographus</i> (Coleoptera: Curculionidae): biology, pest status, and current management options

Abstract Bark beetle Pityogenes chalcographus is a common species that can impact coniferous forests throughout Europe, especially Norway spruce. Under typical conditions, standard forestry management practices do not lead to increased population densities or pose significant threats to forest stands. This beetle multiplies after abiotic disturbances like windthrow, drought, or snow damage, leading to localized outbreaks. P. chalcographus poses a significant threat to young spruce stands and infests the upper, thin-barked sections of older trees, often alongside Ips typographus. To effectively manage P. chalcographus, it is necessary to implement both preventive and direct control measures. Integrated pest management strategies emphasize the importance of maintaining cleanliness in logging areas, promptly removing infested trees, and reducing available breeding material, particularly fresh logging debris. Pheromone traps are primarily used to monitor flight activity. Cultural control measures involve carefully managing logging debris. This includes piling branches in shaded areas to reduce breeding opportunities for beetles. Timely logging and thinning operations are also important for reducing population growth by making trees less susceptible to attacks. In smaller areas, pheromone traps can be used to capture and to concentrate emerging beetles effectively. This comprehensive review underscores the importance of enhancing current management practices to address the rising challenges posed by P. chalcographus in spruce forests. A deeper understanding of its ecological interactions and adaptive strategies will be key to developing more effective control measures.