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- Author or Editor: Réka Szabó x
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Instead of high value willow-poplar galleries and ash-oak-elm galleries stands of non-indigenous species are present at many sites of the flood plain of Danube in the Béda-Karapancsa Region of the Danube Drava National Park. According to the Act of Nature Conservation in Hungary minders of the territories are obligated to change non-indigenous tree species to natural tree species in all forest stands (e.g. monocultures), that are on protected areas. Change of forest structure has to be determined by the recent type of stand, the future stand and the site; its speed is fitted to the whole territory. The affects of water regulation works on the area must be taken in regard. It is necessary to monitor the results of the changes of forest structure by indicators of naturalness. It can be done by the method of naturalness value of forest stands (TERMERD).
Abstract
Guignardia bidwellii, indigenous to North America, is a significant pathogen of grapes long known in Hungary, infecting only the growing green parts of the vine (leaves, petioles, shoots, and bunches). In the absence of adequate plant protection and extreme weather conditions such as a predominantly humid, warm year, black rot of grapes can be expected. The pathogen can cause high yield losses due to grape rot and reduce wine quality if the infection is severe.
The evolution of certain biogenic amine compounds were investigated under the influence of grape black rot. The results obtained showed that they were present in low concentrations from an oenological point of view. Polyphenol composition was consistent with the literature, blackening affected mainly the concentration of catechin. Black rot fungus does not produce β-glucosidase enzyme. In terms of resveratrol content, black rot has no particular effect. However, like Botrytis cinerea, it produces glycerol and, proportionally, gluconic acid in lower concentrations.
It can be concluded that black rot of grapes does not cause health problems when introduced into wine processing.
