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Testování použití stromové injektáže jako způsobu ochrany individuálních dřevin jasanu ztepilého Fraxinus excelsior L. proti infekci houbovým patogenem Hymenoscyphus fraxineus
Rozsypálková, Lucie
In recent years, very good results can be observed in the protection of trees against fungal diseases and insect pests using tree injection technology, so this work aims to test four active substances - tebuconazole, copper hydroxide, sodium selenite and selenium nanotechnology. These were applied by micro-injection to 60 ash trees (Fraxinus excelsior) of the same age and growing in the same climatic conditions. These tree species were inoculated with two srains of Chalara fraxinea prior to injection, and it was verified at the end of the experiment that their pathogenicity was similar. Subsequently, the growth of underbark necrosis was monitored for nine months. Subsequently, analyses of the lengths and areas of the individual root necroses of each variant allowed to confirm the hypotheses. That is, that the most successful in suppressing the pathogen Hymenoscyphus fraxineus would be the product containing selenium nanoparticles and, on the contrary, the least successful would be Champion 50 WP with the active ingredient copper hydroxide.
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Srovnání náchylnosti asijských druhů jasanu vůči infekci voskovičkou jasanovou (Hymenoscyphus fraxineus) na základě inokulačích pokusů
Menšík, Jan
The ash dieback has been known for 20 years. It is caused by pathogenic fungus voskovička jasanová (Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz and Hosoya) which destroys the genus Fraxinus spp. in Europe, both inside and outside the forest. This thesis deals with the interaction of ash with H. fraxineus. Asian ash species (Fraxinus chinensis, F.sogdiana, F. ornus) and even European F.excelsior against H.fraxineus infection have been tested on the basis of inoculation experiments. F.chinensis was completely resistant; F.ornus relatively resistant; F.sogdiana very prone and F.excelsior most prone to H.fraxineus infection. The results were compared to the other types of ash (especially F.americana and F. pennsylvanica). The overall situation of ashs in the Czech cities has been evaluated and measures have been proposed to improve the current situation.
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Infekční biologie Chalara fraxinea a faktory ovlivňující fruktifikaci teleomorfy Hymenoscyphus pseudoalbidus jako zdroje infekce nekrózy jasanu
Rozsypálek, Jiří
The diploma thesis deals with ash dieback caused by pathogenic agent Hymenoscyphus pseudoalbidus. This pathogenic fungus has spread across the whole Europe during the last twenty years and became a serious threat for European ash populations (Fraxinus sp.). This work is mainly focused on H. fraxineus symptomatology in relation to phenology of Fraxinus excelsior L. in situ. Artificial infectious experiments were carried out and several control measures were tested. The methodology of inoculation with ascospores and methodology of evaluation of ash stands infected by H. fraxineus were designed. Outside the terms of assignment of this thesis, the speed of infection spread and mortality rate in stands of different ages were observed. One of the most interesting results is a finding that severe infection causes significant slowdown of phenological phases of F. excelsior. Infectious experiments showed high susceptibility of F. excelsior to the infection. The infection broke out in 83.7% of tested individuals. The susceptibility of F. pensylvanica and F. americana was proved to be considerably lower.
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