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The vitality of a forest ecosystem to a great extent depends on the effect of different factors of stress, be it of biotic (harmful insects, phytopathogenic fungi, etc.), abiotic (frost, drought, high temperatures, etc.) or of anthropogenic origin (human activities). Some factors owning to their long-lasting effect can lead to the weakening of the individual trees or the whole forest ecosystem and eventually cause the mortality of it. The paper presents the results of the research of the types of damages of biotic, abiotic and anthropogenic origin at the sample plot of LEVEL 1 in the Republic of Serbia, conducted during 2013. By the analysis of the data, the results concerning the total number of trees with the identified types of damage, the part of the tree on which the some type of damage occurred most commonly, total number of the trees without any damage, most frequent type of damage and the types of trees with the highest and lowest percentage of damage, were obtained. The results which were obtained present the factual situation regarding the types of the damages for each sample plot and can be beneficial for the further analysis. By comparing these data with the date from other countries, the conclusions about the way in which the vitality of trees depend on the environmental conditions were made.

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Project of forests condition monitoring (ICP Forests) operates as an international European project in which, on grid of ICP sample plots (bioindication points) condition of forests has been monitored annually in continuity, including recording data on defoliation with evidencing any damage to the trees. The main goal of the program is monitoring of condition of forests on a permanent, representative surfaces, arranged in a systematic grid distributed on the territory of of Europe. This paper analyzes the data on defoliation as part of the results of the forest conditions monitoring on ICP sample plots on the territory of the Republic of Serbia, in the period 2012-2016. The assessment of defoliation is performed on the experimental fields regardless of the cause of loss of leaves, because the results are not aimed to determinate the cause-and-effect relationships, but only to represent the state of defoliation on this study sample plots in the researched period. Assessment and analysis of the degree of crown defoliation has been presented for most common tree species as the most noticeable crown health indicators. Linking these results with other indicators of environmental conditions will provide more concrete informations, and draw conclusions about the vitality of the plants depending on ambient conditions.