Large pine weevil

The large pine weevil (Hylobius piceus) is a member of the Curculionidae family within the order Coleoptera. This species is a significant forest pest that primarily targets coniferous trees, often causing substantial damage in forest nurseries and young forest plantations.

The pest feeds on various conifer species, with spruce being the most preferred host. It poses a high risk to newly planted areas where young, vulnerable saplings can be completely girdled by adult beetles, leading to rapid tree mortality.

The biology of the weevil involves a multi-year development cycle. Adult beetles feed on the bark of young shoots and stems, while the larvae live under the bark of weakened, dying, or recently felled trees, tunneling through the cambium and phloem layers.

The damage caused by Hylobius piceus is characterized by necrotic wounds on the stems and root collars. When the infestation is severe, the interruption of nutrient and water flow results in stunted growth, yellowing of needles, and the eventual death of the affected host tree.

Integrated pest management strategies are essential for control:

• stump removal and sanitation logging to reduce breeding sites;
• application of protective mesh or repellent coatings on saplings;
• monitoring adult populations using specialized traps;
• chemical control treatments in nurseries during peak activity periods.