DSpace-CRIS

Now showing 1 - 3 of 3

Some of the metrics are blocked by your
consent settings
Investigating population dynamics of the chestnut blight in North Macedonia through time (1995-2000 and 2022).
(Croatian Forest Research Institute, 2023-02)
Risteski, Mihajlo
;
INVESTIGATING POPULATION DYNAMICS OF THE CHESTNUT BLIGHT FUNGUS IN NORTH MACEDONIA THROUGH TIME (1995-2000 AND 2022) Mihajlo Risteski1*, Kiril Sotirovski1 1Ss Cyril and Methodius University in Skopje, Hans Em Faculty of Forest Sciences, Landscape Architecture and Environmental Engineering *mihajlo.risteski@gmail.com The plant pathogenic fungus Cryphonectria parasitica and the infamous disease known as chestnut blight were initially discovered in the USA in 1904 on Castanea dentata and were recorded already in the late 1930-ties in Italy, on European sweet chestnut. Ever since, it has been disseminated in all European chestnut regions and has reached the eastern area of distribution of chestnut - Georgia, Azerbaijan and Iran. In 1950-ties, cankers showing “spontaneous healing” yielded isolates of the fungus expressing decreased virulence and sporulation. The phenomenon was named hypovirulence and is caused by mycoviruses of the genus Hypovirus. Ever since, scientists and practitioners have used hypovirulent isolates as a method for control of this devastating disease. It was additionally discovered that vegetative incompatibility between isolates of the fungus, is a restricting factor both for immediate suppression of growth of cankers and for the dissemination of hypovirulence within subpopulations of the fungus. Thus, vegetative compatibility (vc), and related aspects such as mating type (MAT), have been subjected to extensive research, both in Europe and the USA. In North Macedonia, in the period 1995-2000, C. parasitica from all larger chestnut populations was collected, isolated and analyzed for vc type diversity and MAT. Of the 786 isolates, the most dominant vc type was EU-12 (94 %), and only other 4 vc types were discovered (EU-1, EU-2, EU-10, EU-22). Regarding MAT, 96 % of the isolates were MAT-1. Hypovirulence incidence varied between subpopulations, ranging from 63 % (Skudrinje) to much lower or completely absent in others, while on the national level incidence was 19,5 % of 488 screened isolates. During 2022, over 500 samples have been collected from the same locations and will be subjected to analyses for the same aspects, with the main objective - comparison with data derived from previous research. We herewith present preliminary data and expected results. Keywords: Castanea sativa, Cryphonectria parasitica, hypovirulence, mating type, vc types
Some of the metrics are blocked by your
consent settings
The fir as a destructor of the forest communities in the Republic of Macedonia
(2012-09-13)
;
In the last 20-30 years in the forests in the Republic of Macedonia has been noted increasing presence of the fir. There are a number of factors that condition the spread of the fir, mainly the higher protection from the harmful effects of the anthropo-zoogenic factor, and changes in the environmental conditions. The spread of the fir is most intense in the zone of the beech forest region, but expansion is observed in the higher oak regions, too. This occurrence is a result of two main reasons: i) spread of the fir regarding natural regeneration; ii) spread of the fir by sowing fir seed in the beech and oak forest communities. The fir as a shade-tolerant species is the one which can survive and thrive as an understory of beech forests and it is capable to have a long time to rest awaiting the favourable moment for expansion in height. In the struggle for light in natural successive processes the fir manages to overcome the beech, which is confirmed by the fact that in high density beech forests the fir’s offspring successfully adapt to site conditions. Thus, it is evident the phytocoenological destructing role of the fir particularly in the beech forest communities in the Republic of Macedonia. In addition, the plant diversity in pure fir forests is poorer then in mixed fir forests. Confirmation of this finding are the data obtained from the management plans which shows the changing of the structure of the forests by composition and volume in favour of the fir.
Some of the metrics are blocked by your
consent settings
Woody plants of the National Park Mavrovo, Republic of Macedonia
(Bulgarian Academy of Sciences, Sofia, 2013-10-01)
The National Park Mavrovo situated in the North-Western part of the Republic of Macedonia range of three mountain massifs- Shar Planina, Korab and Bistra, with an area of about 73,000 ha. It is characterized by great floristic richness, in particular woody plants and forest communities. Part of this plant treasure has encountered in rare, endemic and Tertiary relic species. In the conducted field research mainly during the period 2009-2012 within the Park are determined 149 woody species, which is more than 45% of the Macedonian dendroflora. This represents the dendrofloral richness of the Park. In this paper originated from my MSc thesis are determined woody species as individuals, and within populations, i.e. as a part of the forest associations. Special significance is achieved with the discovery of some new finding sites of the species and dendrological phenomena. The results relate to ecological site characteristics of the dendroflora represented in the Park, and its bio-ecological specificity is expressed through a detailed data tables and charts.

Hans Em Faculty of Forest Sciences, Landscape Architecture and Environmental Engineering

Browse

Filters

Settings

Sort By

Results per page

Search Results