Grey pine weevil

Systematic position. The grey pine weevil (Brachyderes incanus) is a beetle species belonging to the order Coleoptera and the family Curculionidae. It is a well-known pest in European pine forests, particularly thriving in areas with sandy soils where coniferous trees are dominant.

Host plants and damage. The primary hosts of this species include pines, especially the Scots pine (Pinus sylvestris). It can also be found on spruce and larch. The most severe damage is observed in young forest plantations and nurseries, where adults feed on the needles and tender shoots of young trees, causing significant foliage loss.

Biology and life cycle. The life cycle consists of complete metamorphosis. Adult weevils overwinter in the soil or leaf litter and emerge in early spring. Females lay eggs in the soil near the roots of the host plants. The larvae develop underground, feeding on small roots, before pupating in earthen chambers to emerge as adults later in the season.

Nature of injury. The adults are active during the day and climb trees to feed. They bite the edges of the needles, leaving visible notches. In cases of high infestation, they may consume entire needles and strip the bark off young shoots. This feeding behavior stunts tree growth and can lead to the decline of young seedlings.

Protection measures. Integrated pest management strategies are essential for controlling populations:

• Proper site preparation in nurseries to disrupt larval development in the soil.
• Monitoring adult activity and applying contact insecticides when thresholds are exceeded.
• Removing debris and maintaining hygiene in young forest stands.
• Utilizing physical barriers or traps around high-value young plantations to prevent migration.