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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Sezónní dynamika šíření původce sazné nemoci kůry na lokalitě Brno - Sadová
 Janovská, Kateřina
Sooty bark disease is caused by a parasitic fungus Cryptostroma corticale (Ellis & Ever-hart) Gregory & Waller, which survives in its host (mostly sycamore maple) in engophy-tic stage. After exposing the host to stress, especially drought stress, its strong pathoge-nic effects prevailes, which may be fatal for the host. At the research area in Soběšice, aerobiological sampling took place from spring to autumn using automatic volumetric spore trap. DNA extraction and real-time PCR were used to determine the number of C. corticale spores in the samples. The effect of meteorological factors on the spore amounts was determined. More spores were observed in the spring months than in the autumn months under similar conditions.
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Phytopathogenic fungi causing necrosis of Acer pseudoplatanus bark
 Kelnarová, Ivana ; Koukol, Ondřej (advisor) ; Černý, Karel (referee)
Bark necrosis is a symptom of variously serious diseases caused by various pathogens. Sycamore is relatively susceptible to bark necrosis, especially trees weakened by stress such as climatic extremes or anthropogenic pollution. Causal agents are Ascomycetes and also Peronosporomycetes of the genus Phytophthora. Degree of pathogenicity is variable, ranging from local necrosis to cankers invading cambium resulting in death of the host. Pathogens can be classified as opportunistic (Cryptostroma corticale), weak (Prosthecium pyriforme) or obligate (Eutypella parasitica). Saprophytes decomposing dead tissue can also be isolated from necroses. To prove non-pathogenicity of these species inoculation experiments on the host are needed. Mycophagous fungi may grow in necroses as hyperparasites (Acremonium sp.). Various species of invertebrates search for necroses as a source of food and shelter. Several small mammals were observed feeding on bark necroses. Their role in spreading spores and initiating a gateway for infection is also considered.
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