Abbreviature 1n state´s languageSENKO, Mário: The impact of bioclimatic forces and forest condition on the size of the European spruce bark beetle population in Liptovská Osada (Master´s thesis), Technical University in Zvolen, Faculty of Forestry, Department of Forest Protection and Hunting. The supervisor of the thesis: Doc. Ing. Peter Fleischer, PhD., Zvolen TU, 2017, 83s.The goal of this final thesis is assessment of the impact of bioclimatic forces and forest condition on the size of the European spruce bark beetle population in the researched forest area Banskô, which belongs to Liptovská Osada forest management.The diploma thesis has two parts – a theoretical one and a practical one. The extent of the damage caused by the bark insect in spruce vegetation in Liptovská Osada has grown significantly in the recent years. The first chapter of the thesis describes the bionomics of European spruce bark beetle and the causes of its overgrowth; furthermore, it assesses the ways to protect against this bark insect. The second chapter focuses on the researched territory – a general description of the area, its vegetation condition and its outposts characteristics. Methodology of the thesis is described in the fourth chapter, which analyzes bioclimatic an climatic conditions in the researched forest area as well as their effect on the size of the European spruce bark beetle population. It also describes the condition of the vegetation and the spruce´s predisposition to be attacked by the bark spruce bark beetle. The decisive factor in the size of the beetle´s population and hence in the probability of the risk of the further damage of the vegetation is the number of generations in the course of one year. A part of the methodology in the fourth chapter is the so called PHENIPS model, which allows to specify the cycle of each developmental phase and the number of generations on the basis of the average temperature of the bark. The results in the fifth chapter are determined with the help of PHENIPS. Its entry values are the average daily air temperatures and the daily sum of the sun radiation obtained from SHMÚ. With the help of traps, the beginning of spring swarming according to Seifert and Zumr is set. At the same time, the expected phenology process of the various developmental stages as well as the number of the generations of the beetle is assumed. The final chapter deals with the evaluation of the further expected development of the spruce vegetation affected by the European spruce bark beetle, proposed protective measures and the examples of the current and future care.