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The aim of this study is to determine (1) whether the yellow mistletoe (Loranthus europaeus Jacq.) favors attacking only the certain species of the genus Quercus, (2) the age structure and (3) the sex ratio of hemiparasite in the selected area. Furthermore, (4) the assessment of the relationship between the age structure and weather in individual years. Location Pouzdřanská step was chosen for this purposeas on the relatively small area 6 species of oak and yellow mistletoe are growing. The age and sex of the individual hemiparasites was assessed either directly from the ground or climbing up to the crown. It was found that all investigated species of the genus Quercus are infested by yellow mistletoe. The most infested oak species are Quercus petrea, Quercus polycarpa a Quercus robur. The oldest yellow mistletoe individual was 21 years old and grew on Quercus pubescens. There were more frequent males individual. There was not found any apparent relationship between the history of weather and attachment of the yellow mistletoe to the host.

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Abstract of the work This thesis deals with the growth characteristics of oak at the stage of coppice that was based in different variants depending on the type of mixing and method of recovery (combined, artificial). The research areas are located in Kostelec woods which is about 7 km from the Holešov town in the district of Kroměříž. In total there are five areas evaluated, the area (I, II) Option 1 - monoculture and area (III - V) Option 2 - mixed (combined and artificial regeneration). Crops were chosen so as they are the same age, only the area V is older and without silvicultural intervention. The measurement of tree species was carried out in each alternative on the pad of 3.14 m2 (r = 1 m) in a regular grid of 5x5 m. On each space were measured height, výčetní tloušťka a cenotické postavení of all trees and quality of the treetop. Collected data are recorded in tables and graphs. The results of the thesis show that the oaks in option (1) in all the above parameters are better than in the variant (2).

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The study analyses growth and development of Northern red oak stands in the Czech Republic. The Northern red oak stands under study have the age span between 17 to 159 years. The study also investigated the influence of the species on soil upper horizons. The results show the high wood production potential of red oak when compare to sessile oak being at the same or higher quality and health. Data show slower decomposition of biomass in upper soil horizons under red oak causing acid reaction of soils. The data propose the red oak to be a good additional species in lowland stands and it could be a species which substitutes domestic oaks where tracheomycosis diseases can occur