The thesis describes the insects and mites, that were discovered in the vegetation season in 2010 and 2011 on woody plants, by the method of the walk on a defined transect of Jesenkova pot in Ljubljana. Samples were collected (damages and adult insects) and the causes of injuries have been determined. 27 different insect species and 8 different species of mites, is determine. They are classified by tree species on which they were discovered. Thesis is focused on 6 relatively new and invasive insect species, that have occurred sporadically in our country, namely: Phyllonorycter issikii, Dryocosmus kuriphilus, Obolodiplosis robiniae, Phyllonorycter robiniella, Parectopa robiniella and Oxycarenus lavaterae. Describes their bionomics, distribution, host plants and measures to control population density. Chesnut gall wasp (D. kuriphilus) was developed in 2010 at Rožnik in Ljubljana, is alien invasive species, that can cause significant economic damage. Other described pests mainly affecting the aesthetic appearance of the plant. The purpose of this thesis is to rerview causes of damage on woody plants in urban environment, description of the damages and how the recommendations could affect the size of their populations in order to limit the damage on the host plants.
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