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This study focused on the occurrence of xylophagous beetles and nematodes in the different parts of Pinus sylvestris L. trees of different health condition in the pure stands in Zhytomyr region (Central Polissya). Stem fragments with thin, thick and transitional bark, branches and twigs were examined in each of 12 model trees. Xylophagous beetles were identified by adults or by galleries. Nematodes were isolated from wood samples in the laboratory using the Baermann method and identified by morphometric characteristics. Among 10 species of xylophagous beetles, Ips acuminatus (frequency 16.7%; dominance 17.9%) and I. sexdentatus (frequency 11.1%, dominance 54.6%) dominated, which prefer the fragments with thin and thick bark respectively. No xylophagous beetle was found in the healthy and slightly weakened trees. Among 15 nematode species, 40% were saproxylic, 33.3% entomophilic, 13.3% phytophagous, and by 6.7% predators and species associated with fungi. An entomophilic nematodes Cryptaphelenchus macrogaster f. acuminati was common in all parts of stem and branches (frequency of occurrence 25–33.3%). An entomophilic nematodes Parasitorhabditis acuminati and a predator Fuchsia buetschlii acuminati had the highest frequency of occurrence (41.7%) under the thin bark and in the branches. The frequency of these species in colonized with xylophagous insects stem fragments with thin bark was significantly higher than in respective not colonized fragments.

(Dendroctonus ponderosae) activity on the 1988 Yellowstone fires. Ecosystems, 9 (8), 1318-1327. DOI: 10.1007/s10021-006-0173-3. Lombardero, M.J., Ayres M.P. 2011. Factors influencing bark beetle outbreaks after forest fires on the Iberian Peninsula. Environmental Entomology, 40, 1007-1018. DOI: 10.1603/EN11022. Lopez, S., Goldarazena, A. 2012. Flight dynamics and abundance of Ips sexdentatus (Coleoptera: Curculionidae: Scolytinae) in different sawmills from Northern Spain: Differences between local Pinus radiata (Pinales: Pinaceae) and Southern France incoming P. pinaster

. Cross-scale drivers of natural disturbances prone to anthropogenic amplification: the dynamics of bark beetle eruptions. AIBS Bulletin , 58, 501–517. Sevim, A., Demir, I., Tanyeli, E., Demirbag, Z. 2010. Screening of entomopathogenic fungi against the European spruce bark beetle, Dendroctonus micans (Coleoptera: Scolytidae). Biocontrol Science and Technology , 20 (1), 3–11. Steinwender, B., Krenn, H., Wegensteiner, R. 2010. Different effects of the insect pathogenic fungus Beauveria bassiana (Deuteromycota) on the bark beetle Ips sexdentatus (Coleoptera

:92–100. Wegensteiner, R., Tkaczuk, C., Bałazy, S., Griesser, S., Rouffaud, M., Stradner, A. et al., 2015: Occurrence of pathogens in populations of Ips typographus , Ips sexdentatus (Coleoptera, Curculionidae, Scolytinae) and Hylobius spp. (Coleoptera, Curculionidae, Curculioninae) from Austria, Poland and France. Acta Protozoologica, 54: 219–232. Weiser, J., Poltar, O., Žižka, Z., 2000: Biological protection of forest against bark beetle outbreaks with poxvirus and other pathogens. IUAPPA, Section B, 12:168–172. Weiser, J., Wegensteiner, R., 1994: A new type of Entomopoxvirus