White-horned horntail

Systematic position: The white-horned horntail (Urocerus albicornis) belongs to the order Hymenoptera and the family Siricidae. It is a wood-boring wasp that acts as a significant pest in coniferous forest ecosystems and timber storage facilities.

Host plants: The pest primarily targets coniferous trees, including species such as fir, spruce, pine, and larch. It is particularly attracted to stressed, dying, or recently felled trees, as well as untreated logs stored at sawmills.

Biology and life cycle: The life cycle typically spans one to three years depending on environmental conditions. Females use their ovipositors to drill into the wood and deposit eggs. Once hatched, the larvae tunnel deep into the tree, consuming wood tissues and growing steadily within the internal galleries.

Damage and economic impact: The larvae cause structural damage by creating extensive galleries inside the wood, which are packed with frass. This significantly degrades the quality and commercial value of timber, often rendering it unusable for high-grade construction purposes.

Protection measures: Effective management strategies include the prompt removal and disposal of infested or dead trees from the forest to reduce the breeding population. In timber yards, applying insecticides to logs, maintaining rapid turnover of stock, and implementing proper storage practices are crucial to preventing adult females from laying eggs.