Characteristic resin-funnel at the base of the stem (partly violet stain, mixture of bore shavings and resin – frass); needle discoloration of the whole crown; eggs are deposited at the stem base or on superficial strong roots; hibernation in every stage of development possible; roundish tunnels below the bark with dense layers of bore shavings (feces and shavings); largest bark beetle of central Europe (7-9mm in size), dark brown, without any teeth on the hind end; larva light beige to white, without legs.
Affected tree species
Fir; Larch; Pine; Spruce;
attacks mostly trees, which had been mechanically damaged on the stem; younger trees may die, older trees may suffer severly from loss in increment and vitality; prefers spruces 20-40 years old.
Curative measures Removal of attacked trees from the stand; watch for infested strong roots!
Great spruce bark beetle
Great spruce bark beetle, larva (Foto Landesregierung Stmk., Pfister)
Great spruce bark beetle, tunnels at the stem basis (Foto Landesregierung Stmk., Pfister)
Great spruce bark beetle, resin flow at the stem base (Foto Landesregierung Stmk., Pfister)
Great spruce bark beetle, shavings, on the right side (Foto Landesregierung Stmk., Pfister)