Norway spruce - Picea abies (L.) Karsten. Insects on trunks, branches and in the wood - Part III.
The following insects which appear on Norway spruce (Picea abies) are presented: two species of bark beetles, Hylurgops palliatus and Hylurgops glabratus which appear on trunks, the Norway spruce weevil (Pissodes harcyniae), the brown spruce long-horn beetle (Tetropium fuscum) and the black spruce long-horn beetle (Tetropium castaneum) which also appear on trunks; three species which live in wood: the large timberworm (Hylecoetus dermestoides), the greater horntail wasp (Urocerus gigas) and steely-blue wood wasp (Sirex juvencus); species of carpenter ants (Camponotus herculeanus) and the spruce bark tortrix moth, Cydia pactolana. In Slovenia the first two species appear on felled trees, the next three species are periodically harmful; the following three species are present in felled material, while the latter three species - the large timberworm, the greater horntail wasp and the steely-blue wood wasp - are technical pests of wood. The next species (carpenter ant) colonizes the early part of annual wood ring and takes part in wood decomposition, while the spruce bark tortrix moth which lives in healthy trunks of Norway spruce causes lesions of the host. A short description of their morphology, bionomy, a description of damages, possible misidentifications, hosts, their most important natural enemies, and for some species reasons for increase of their population densities are described.