The process of dying of trees in a forest stand is one of the most important developmental processes of forest ecosystems. The work presents the carried out study of the structure (composition and occurrence frequency) of subcortical insects community dwelling in Scots pine trees during the artificially initiated process of dying of trees. The analyses were conducted in the stands of the Durowo Forest District, in forest habitats of fresh and mixed forests (Bśw, BMśw, LMśw, Lśw). The trees were classified in into III, IV and V classes of age (from 41 to 100 years old). It was found that the community of subcortical insects in the initial stages of dying process were composed of cambiofagous species (for example Tomicus piniperda, Hylobius abietis). Among these species, Tomicus piniperda showed the largest frequency. In the advanced phase of tree dying, the community of subcortical insects was getting rich in species. It consisted of 9 cambiophagous and xylophagous species. There were two dominating species: Asemum striatum and Pissodes sp. The reproductive potential for Tomicus piniperda and Hylobius abietis (pine weevil) was defined too. It was also found that the accumulated pine wood (e.g. loose wood piles) can be supplemental nesting base for the weevil.

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