The article presents the results of forest pathology examination of 1123 trees on 7 streets and in 2 parks in the Central district of the city of Voronezh. A comparative analysis of the pathology of native and exotic species is given, which showed that native species survive longer in group plantings, and introduced plants – in linear. A number of features of the occurrence of abnormalities in trees in urban plantings is revealed. In particular, a massive chemical burn of the horse chestnut leaf is recorded 100 % loss with powdery mildew of English oak leaves, also 100 % loss of leaf-mining insects of linden macrophylla.

The article deals with the issues of green spaces dedicated to public use by the example of the children´s park "Eaglet". The studies were conducted using standard methods forest pathology survey - continuous enumeration. In carrying out comprehensive studies on the evaluation of plants used standard methods of taxation, silvicultural, environmental, geographical and botani-cal research. The main purpose of the survey was a full-scale analysis of the structure and as-sessment of existing plantations. The structure of plants includes the determination of the species composition, age structure, the nature and density of plants.

The article is devoted to date the impact of negative factors on the urban environment plants. Causes of pathologies can be divided into groups: induced mutations, abiotic factors, human factors, biotic factors. As authors of the research objectives was determined on the basis of an attempt of a pathological condition of the trees reveal the influence of certain groups of factors. Results of the study was to identify the most resistant O-types in the urban environment, a comparison with the pathological appearance-marks on woody plants in the conditions of the urban environment.

Revealed objective differences in the pathogenesis of native and introduced tree species. Increased percentage of dam-aged crowns phytophagous exotic species in the park plantings due to their mixed and thickened, which contribute to the for-mation of the natural ecological community that implies the presence of parasitic entomocomplexes. From the presented data and analysis, we can conclude that in street plantings of Voronezh introduced species of trees, with all things being equal, feel at least no worse than the trees of local species.