National Repository of Grey Literature 11 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Comparison of bark boring species composition on douglas-fir and spruce
Trepáč, Matěj ; Pešková, Vítězslava (advisor) ; Šenfeld, Petr (referee)
The aim of this bachelor's work was observation and follow-up evaluation of tree trap of Douglas fir, Pseudotsuga menziesii ((Mirbel) Franco, 1950), and Norway spruce, Picea abies ((Linnaeus.) H. Karsten, 1753). This work was focused on the attractiveness of Douglas fir in comparison with Norway spruce, primarily on bark beetles. Two years in sequence 6 pairs of tree trap above mentioned species were evaluated each year at locality Zelená Bouda. Evaluation were made during period of spring attack, before adult bugs were ready for swarming. Four sections were evaluated at each tree trap. The basic method was quantitative comparison based on results that we obtained during this research. Obtained results were recorded into transparent tables and graphs according to individual year with year-on-year comparison. Written evaluation was following behind. Results can be used as a basis for desicion making if Douglas fir is appropriate for growing in ours conditions in larger scale. So far we can presume from obtained results that Douglas fir is less attractive then Norway spruce.
Decaying fungi on selected sites in protected landscape area Karlštejn
Tesárková, Monika ; Pešková, Vítězslava (advisor) ; Čížková, Dana (referee)
The thesis aims to evaluate the state of health of tree species growing in Karlštejn National Nature Reserve, with the main focus on ligniperdous fungi found in this location. Data were gathered in two experimental sites near Hostím and Bubovice villages, situated in the protected landscape area of Bohemian Karst (Český Kras). Tree species were inventoried in both designated sites and list of individual species of wood decaying fungi was put together. Furthermore, the state of health of tree species was evaluated according to crown defoliation and abiotic damage. The thesis also briefly describes the history of Bohemian Karst Protected Landscape Area and other related themes climatic and soil conditions, including geological and geomorphological characteristics of this region that significantly influence the natural character of the territory, including occurrence of ligniperdous fungi. The examination and subsequent controls of the selected sites took place once a month in period lasting from April 2015 to November 2016, revealed that only common species of wood decay fungi are found in the area of Karlštejn National Nature Reserve, which is part of Bohemian Karst Protected Landscape Area. These fungi are commonly present in the territory of the Czech Republic, therefore no unusual or new species of wood rotting fungi were found. The Korovitka (Diatrype) is the most widespread decaying fungi in both experimental plots, but the only one found fungal patogen Sphaeropsis sapinea, which in recent years has spread further and causes death and drying of pine trees has an economic importance for this area. Due to the good health of trees were found no major differences in the defoliation of trees, up to the aforementioned black pine attacked by fungi Sphaeropsis sapinea. There was observed defoliation from 45 to 100 %. There was no significant damage abiotic species found in the areas under examination.
Most important pathogenic fungi in The National Park Bohemian Switzerland
Tiler, Michal ; Pešková, Vítězslava (advisor) ; Šrůtka, Petr (referee)
Abstract This diploma thesis evaluates about the current state of health of forests in the National Park Czech Switzerland. The aim was explored the most pathogenic fungi found in the national park and was determined their distribution, meaning a major threat for trees of the area. The first part describes about the fungal pathogen found in the national park. And presents their description, biology, symptoms of damage and, ultimately, their seriousness and protection. Second part describes the most important trees of the field. In the National Park are the most important spruce, Scots pine, silver fir and hardwoods are mainly beech. The third part describes a self-monitoring and survey identified fungal pathogens based on field research. Important pathogens are from genus Armillaria, types Lophodermium pinastri , Lophodermium seditiosum, Lophodermium piceae, Meloderma desmazieria and Hymenoscyphus fraxineus. The final section assesses the condition of health of trees. For that assessment was used defoliation. The assessment was performed in stands of spruce, ash and fir. There were assessed 348 specimens with average defoliation of spruce 43.5%, 194 specimens with average ash defoliation 51.2% and for fir´s 71 specimens was average 52.7% defoliation. Work submitted actual, comprehensive overview about the state of health of forests in the National Park Czech Switzerland in terms of possible danger from fungal pathogens. No fungal species are found currently significantly jeopardizes the health status of assessed trees.
Investigations of fungal pathogens of Douglas-fir on various provenance plots
Lísková, Aneta ; Pešková, Vítězslava (advisor) ; Vachová, Jana (referee)
The bachelor thesis evaluates the incidence of fungal pathogens due to various provenance of Pseudotsuga menziesii Mirbel, Franco. The research was conducted on the provenance area Jizbice - LS Vlašim. In this area, the presence of fungus of the genus Armillaria was evaluated. By using standard phytopathological methods, samples of needles and offshoots were taken, and the occurrence of the various needle blight species was investigated. In the field the preliminary determination and quantification of the occurrence of fungus pathogens infestation were implemented. Consequently, the microscope method was used for the fungal species spectrum completion and specification in the laboratory. The fungus Rhabdocline pseudotsugae was discovered. The fungus Rhizosphaera genus was discovered on some needles from the researched provenances. The occurrence of the Armillaria spp. was not confirmed. It was determined, that it highly depends on the provenance of the infested tree. The most resistant provenance was Nimkish (1025), located in the north part of the Vancouver island, British Columbia. The least resistant provenance, in terms of defoliation, was provenance Merritt (1028) from British Columbia. Correspondence analysis results showed that the provenance of 1010 and 1028 showed the highest number of individuals and can be expected to have better resistance to abiotic and biotic effects of harmful factors.
Sensitivity of Czech provenances of European common ash and narrow-leaved ash to invasive pathogen Hymenoscyphus fraxineus
Kraus, Marek ; Pešková, Vítězslava (advisor) ; Čížková, Dana (referee)
This thesis deals with a survey of provenance areas and assessment of attacking Fraxinus excelsior L. and Fraxinus angustifolia by the pathogen Hymenoscyphus fraxineus. The aim of the thesis is to map the incidence of infected trees in these areas and to evaluate the sensitivity of the sites to the pathogen Hymenoscyphus fraxineus. The theoretical part deals with processing of data collected during field work on selected provenance areas Koneprusy and Veltruby. Amongst the evaluated parameters there were: trunk diameter at measuring height, tree height, and especially canopy drying caused by Hymenoscyphus fraxineus. As the outcome of the survey photographs were taken and records were collected for individual trees in the provenance areas. Each of the trees has its own unique label that has accurately defined its location to prevent potential errors in data processing. The processed data was then evaluated in NCSS 8.0 software and cluster analysis was performed in order to compare the provenances. This analysis only compares the provenances, which are located in both provenance areas. The results show that no provenance without the pathogen Hymenoscyphus fraxineus attack appeared in the provenances Koneprusy and Veltruby. Subjects in 4 ŠLP Kostelec nad Černými Lesy - Svojšice and 24 LS Czech Krumlov Chvalšiny proved to be more resistant than others. Although the increase in the tree height and the trunk thickness is the largest on those areas the defoliation rate is high. It is probable that the population of these provenances will gradually die. Due to growing abbility of some individuals located in other provenances it is obvious that habitat conditions and individual resilience are key factors.
Comparison of bark boring species composition on douglas-fir and pine
Košík, Kamil ; Pešková, Vítězslava (advisor) ; Šenfeld, Petr (referee)
This work deals a comparison the diversity of species of bark beetles on Douglas fir (Pseudotsuga menziesii Mirb./Franco) and Scots pine (Pinus sylvestris L.). On location the Green Shed in the Central Region of the Czechia were laid 24 traps, so that Douglas fir and Scots pine formed a couple. They were prepared two variants - trees up to 30 years and a trees of 40 - 60 years old. Evaluation took place after four sections in the relative distances. Research has shown that the both species of the trees were not broad spectrum of bark beetles. On Douglas fir it was only a Pityogenes chalcographus L., who was found in only one trap tree at the age of 30 years, and on the Scots pine trap tree was found only Tomicus piniperda L., but it was found in most traps.
Comparing health condition of the trees in the park Zámecký and the park Husovy sady.
Adamcova, Iveta ; Čížková, Dana (advisor) ; Pešková, Vítězslava (referee)
the purpose is to summarize the historical events in the park until the present. Performs an inspection of the park, checking damage by both biotic (fungi, insects) and abiotic factors. At castlep ark will be performed inspection whether anything has changed since the previous investigation. On this basis, there will be in the end performed comparison of the state of health and occurrence of disturbances of individual parks. There will be valued the presence of pathogenic fungi, insect pests and abiotic damage. In all cases there will be done photographic documentation.
The health condition of trees in natural monument Modřanská rokle
Merkl, Tomáš ; Čížková, Dana (advisor) ; Pešková, Vítězslava (referee)
This thesis deals with monitoring of the health condition of natural monuments Modřanská rokle. The aim of this study was mapping and evaluation of biotic and abiotic factors that influence the growth of local species. Subsequent to their description and evaluation with regard to on what tree species occurred. To what extent they also threaten of the woods in favorite place for walks and sports of Praguers. The research was conducted by repeated terrain errands during which those individuals were monitored which had external signs of damage. During survey were taken the photographs. Checking of the trees was carried out in the line transects along the creek Libušský. Followed by consultations and evaluation of collected materials and summarized in the conclusion. The field investigations were carried out from March 2015 until the end of February 2016. Harmful factors were identified and described according to photographs taken with the help of literature and Internet sources.
Wood decaying fungi in the natural forest in the southern part of Brdy.
Šourková, Zuzana ; Čížková, Dana (advisor) ; Pešková, Vítězslava (referee)
The aim of my work was to determine the species diversity and frequency of wood decaying fungi in selected areas of natural forest in the southern part of Brd around Třemšín. The site I chose four different areas, where I was looking decaying fungi in the period from April to November. Further I describe the system of distribution mushrooms, splitting wood destroying fungi, concept tree disease, the importance of fungi in nature, spread of fungi. Described was also monitored site. Finally, work has formed an overview of wood decaying fungi found on those areas with their frequency of occurrence. Total found 39 kinds of wood decaying fungi from different families. Found wood decaying fungi were photographed and then described.

National Repository of Grey Literature : 11 records found   1 - 10next  jump to record:
See also: similar author names
2 PEŠKOVÁ, Vendula
8 PEŠKOVÁ, Veronika
8 Pešková, Veronika
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