Douglas fir (P. menziesii) is a non-native tree species that could be used in artificial forest regeneration in the future. Prior to the possible increased use of this alien tree species in the regeneration of our forests, it is necessary to study the impacts and risks posed by various diseases and pests. In the diploma thesis, we therefore reviewed foreign and domestic professional literature on the topic of diseases and pests of Douglas fir (P. menziesii). We found 212 different species, of which 53% belong to the phylum Arthropoda and 37% to the kingdom of Fungi. The other 10% are represented by bacteria (Bacteria), nematodes (Nematoda), phytophthoras (Phytophthora spp.) and plants (Plantae). Out of the total number of 212, 105 species are expected to be present in Slovenia. Most of these organisms are classified as fungi (49 species) and insects (48). Among the latter, the most represented are orders Coleoptera and Lepidoptera. Reports of Douglas fir damage in Slovenia are very rare. 10 organisms were recorded, namely the fungi Armillaria mellea, Armillaria ostoyae, Botrytis cinerea, Nothophaeocryptopus gaeumannii, Phacidium coniferarum, Rhabdocline pseudotsugae and Hypholoma fasciculare, and the insects Adelges cooleyi, Melolontha melolontha in Pityogenes chalcographus. Based on the reviewed literature, we conclude that the Douglas Fir (P. menziesii) in Slovenia is currently not endangered due to diseases and pests. However, given the large number of potential harmful organisms present in Slovenia and the climate change that awaits us, this may change in the future.
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