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Analýza příčin chřadnutí a odumírání bříz ve vybraných parcích hl. m. Prahy
Spěváček, Michal
The study is a comprehensive survey of silver birch trees (Betula pendula) located in four parks in Prague 6. In 2022, a dendrological survey of 112 trees was carried out. Selected manifestations of decline (dieback, sapwood, trunk swellings, trunk base wounds, exit holes, fungal fructification organs) were quantified and examined including laboratory tests. With the exception of Disculina betulina, no harmful non-native organisms were confirmed, but research on bacterioses and phytophthora was not conducted. It was concluded that the health and vitality of birch trees are significantly impaired across the surveyed parks and age classes. The decline of birch trees in Prague is a long-term problem resulting from various causes with drought probably playing a central role. Damage to the root and trunk base is also a crucial factor. The paper provides suggestions for improvement in its conclusion.
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Monitoring zdravotního stavu jedle bělokoré (Abies alba Mill.) na vybraných plochách LS Náměšť nad Oslavou
Nováček, Martin
The diploma thesis pursues an assessment of the health condition of white fir (Abies alba) in selected areas of the Náměšť nad Oslavou forest administration. All 888 of the white fir trees (Abies alba) on the two research grounds, in the 7th age class, were incorporated into health classification, the symptoms of damage to the tree species were evaluated and the presence of wood fungi, insect pests and other negative factors affecting the studied trees was determined. From the symptoms found, it was assessed that among the abiotic damage, drought and wind had the greatest effect on the health of the trees. Among the biotic damages, white mistletoe (Viscum album), wood-decaying fungi and insect pests had a significant negative effect.
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