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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Možnosti využití kapalných přípravků s růstovými stimulátory a organickými fungicidy pro eliminaci václavky na stanovištích definovaných půdně nutričními poměry 5. a 6. LVS
 Dujka, Petr
The Norway spruce (Picea abies (L.) Karst.) is the most widespread commercial species in the Czech Republic. Due to a massive expansion out of its optimal environment, the spruce is exposed to negative effects of abiotic and biotic factors. One of these factors is fungus species Armillaria ostoyae (Romagn.) Herink. The first part of thesis contains brief overview of ecology characteristics both for spruce and Armillaria. In the second part, the field and laboratory analyses of samples from research area Solná hora in Zlatohorská vrchovina mountains are described. The research is focused on the study of Armillaria fungus inhibition and includes the results of temporal testing of product Fungil via in vitro tests. Conclusions are focused on application of results in forest management.
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Zhodnocení vlivu václavek na stabilitu sekundárních smrkových porostů na LS Ruda nad Moravou, revír Brníčko ve vztahu k aktivizaci podkorního hmyzu
 Mutina, Michal
The thesis is focused on the proportion of salvage felling caused by Armillaria, selected according to age classes and is also focused on the bark beetles, which colonize infected trees. Armillaria infestation is very acute in the selected area of LS Ruda nad Moravou, the district of Brníčko. A part of the thesis is an evaluation of the influence of abiotic factors on the activation of Armillaria and bark beetle, their species spectrum in the selected territory. The results show that the high temperature and lack of precipitation cause physiological weakening of trees, which are susceptible to Armillaria attacking and bark beetles.
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Carbon Stable Isotopes in Spruce Tree Rings as a Marker of Pathogenic Fungal Attack of Trees.
 NECUDOVÁ, Lucie
Trees are long living plants, which use carbon from the air and hydrogen and oxygen predominantly from soil water for their growth. They deposit these elements largely into a wood where they may persist for thousands of years. Tree growth is influenced by environment, especially by air temperature and precipitation. These factors have an effect on stomatal conductance and photosynthesis rate which influence carbon stable isotope ratio (13C/12C) in the tree tissue. This thesis is focus on stable carbon isotopes in tree-rings of Norway spruce attacked by honey mushroom, and Norway spruce which doesn?t show any signs of disease. The hypothesis of the thesis is based on an expected difference in carbon isotope fractionation during photosynthesis between the spruce attacked by honey mushroom and a ?healthy? spruce. The difference in isotope fractionation could be caused by water deficit induced by honey mushroom disease in the tree. We expect that the attacked spruce defends against water loss by closing stomata, and it could lead to lower CO2 concentration in the needles and higher ?13C value in tree-rings biomass The stable carbon isotope analysis (IRMS) was done on tree-rings of four spruce pairs, each one including an attacked spruce and spruce which didn?t show any signs of disease. Carbon isotope ratio of early wood, late wood and in biomass of the whole annual increment was measured. In contrary to our hypothesis we did not fined any systematic difference in isotopic composition between the attacked spruce and the spruce which did not show any signs of disease.
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