Forest and wood pests electronic identification and monitoring system

Hylobius abietis

Large pine weevil

Tvrdoň smrekový. Foto : M.Zúbrik
Poškodenie. Foto : M.Zúbrik

The adult is dark brown with pale little spots on elytra. It is 10 to 14 mm long. The head is elongated into a noticeable nose with antennae on its end. The female lays eggs onto roots of fresh pine and spruce stumps. The larva is whitish, limbless, slightly arched, 12–23 mm long. It pupates in the bark. Feeding under the stump bark is not harmful; to the contrary, it speeds up their decay. The maturation feeding of sexually immature adults is dangerous on conifer seedlings, especially pines. Feeding of adults on trunks is square. The adult beetle feeds on the bark just above the ground, in deep, funnel-like holes up to sapwood, which causes intense resin production. In case of severe attack, it damages the entire little trunk and the seedling dies.

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Surface damage to trunks and branches of young trees.

Tree Species: Fir, Spruce, Larch

Part of a plant- attacked: Tree trunk

Pest significance: Very harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Pest group: Insect

Depth of  damages: Bark, Under bark only, Up to 0,5 cm depth, Up to 2 cm depth

The extent of damage: Whole trunk

Prevalence in Europe: Very common

Damaged products: Fresh timber logs (water still in the sapwood)

Roundwood size: Diameter up to 10 cm

Wood discoloration: No

Exit holes: Round

Pest subcategory: Wood-boring insect

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