The diploma thesis focuses on the phenological development of the population and the number of generations capable of developing during one year of spruce litch (Ips.typographus) at the experimental site Vyšné Hágy. Where were the model examples for IT development on the calamity area and live tree (Picea abies). Climate data was obtained from the Research Center database for long-term ecological research Vyšne Hágy. In the first chapter this diploma thesis deals with the bionomial Spruce bark beetle and deals with the issue of its reproduction and impact on spruce stands. In the next chapters, the thesis deals with climate change that is influencing the IT development of IT interactions between landscape, tree and tree. Effect of calamity sites on IT development and group shielding in fields not affected by an extraordinary event. The work is also aimed at familiarizing with DPZ and its use in the estimation of IT development on damaged crops. The result of the thesis is a comparison of the phenological development of IT in 2016 on the VH surface and living tree at the VH site. Determining the number of terminated and anticipating IT generations due to climate change and their subsequent impact on the following year. The analysis of the size of the spruce lizard is based on the phenological model Phenips, which predicts the evolution of the stages and the number of generations during the year based on the average daily air temperature and tree bark. Based on the increased number of generations in one year, we can expect that both the rise in air temperatures and the increased volume of untreated calamities will contribute to the growth of the sub-insect population and thus the extent of damage to spruce stands.