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Wyszukujesz frazę "ash dieback" wg kryterium: Temat


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Tytuł:
Występowanie i proces rozprzestrzeniania się Chalara fraxinea na jesionie wyniosłym (Fraxinus excelsior L.) na terenie wybranych krajów Europy Północnej
Occurrence and spread of Chalara fraxinea on common ash (Fraxinus excelsior L.) in the selected countries of Northern Europe
Autorzy:
Turczański, K.
Powiązania:
https://bibliotekanauki.pl/articles/989540.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
jesion wyniosly
Fraxinus excelsior
zamieranie drzew
czynniki chorobotworcze
grzyby
Chalara fraxinea
wystepowanie
rozprzestrzenianie sie chorob
Wielka Brytania
Irlandia
Dania
Szwecja
ash dieback
united kingdom
ireland
denmark
sweden
Opis:
Dieback of common ash is a worrying phenomenon that emerged in the early 1990s. The first symptoms were observed in 1992 in Poland. In 1996 the plague appeared in Lithuania, followed by Germany, Denmark, Czech Republic, Austria, Slovenia, Sweden and France (2002−2009), to finally reach the British Isles in 2012. At the beginning it was said about the disease of ash, but a few years later it became the issue of ash dieback. Despite many research and the cause identification, the problem still exists. The aim of article is to show the overall picture and the prior knowledge of the phenomenon on the example of four Northern European countries: Great Britain, Ireland, Denmark and Sweden. Considerations were mainly focused on the UK and Ireland, which because of the insular location are an area of slower spread of the Chalara fraxinea – fungus considered to be the one of the main factors responsible for ash disease. Moreover, the selection is determined by the weather and habitat conditions where the described species have their optimum range. To the contrast, Denmark and Sweden were mentioned also. The described species has a much worse state of health in that countries. In order to describe the current state of the spread of ash dieback, we selected official documents and factsheets available on the government websites. In case of described countries, quick response and proper identification of the cause of ash dieback allowed to take appropriate steps to fight Chalara fraxinea before the disease has spread in the local population. Appropriate government regulation, cooperation with local forest owners, education and action plans at the moment seems to function properly especially in Great Britain and Ireland. Quite other conditions are in the countries of the continental Europe, including Poland, Lithuania, Denmark and Sweden, where the fungus had made quite large losses in stands of common ash long before it was determined the main cause of this phenomenon. Undoubtedly a huge role in the rapid spread of the pathogen has a geographical location and quick response on the disease.
Źródło:
Sylwan; 2016, 160, 07; 539-546
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphologial variation in colonies of Chalara fraxinea isolated from ash (Fraxinus excelsior L.) stems with symptoms of dieback and effects of temperature on colony growth and structure
Zróżnicowanie morfologiczne kolonii Chalara fraxinea wyizolowanych z jesionów (Fraxinus excelsior L.) z objawami zamierania oraz wpływ temperatury na ich wzrost i strukturę
Autorzy:
Kowalski, T.
Bartnik, C.
Powiązania:
https://bibliotekanauki.pl/articles/28411.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
morphological variation
colony
Chalara fraxinea
isolation
ash
Fraxinus excelsior
stem
dieback symptom
temperature effect
colony growth
colony structure
Opis:
The present paper presents the results of long-term observations of differences in growth and morphology of colonies of C. fraxinea isolated from ash stems with symptoms of dieback and the results of studies on effects of temperature on growth and morphology of colonies in vitro. Thirty randomly chosen C. fraxinea cultures, originating from six Forest Districts in southern and northern Poland, viz. Andrychów, Gryfice, Kańczuga, Lębork, Miechów and Mircze, were included in the temperature assay. Colony growth and morphology were evaluated in vitro, on malt extract agar. Two replicates of each isolate were incubated at 5, 10, 15, 20, 25 and 30oC in darkness. Colonies of C. fraxinea isolated from necrotic stem tissues of diseased ash trees differed greatly in colour, structure, growth rate, presence of sectors and stromata as well as the intensity of conidial sporulation. Colony characters were often lost in further sub-cultures grown on the same medium. Colonies of C. fraxinea grew at 5-25oC in vitro. Three isolates still grew, though slowly, at 30oC. The optimum temperature for growth was 20oC. Among 30 isolates tested, five grew most quickly at 25oC and four at 15oC. Differences among colony diameters recorded at 5, 10, 15, 20 and 30oC were statistically significant, while differences at 15 and 25oC were not. At some temperatures, statistically significant differences in growth rate were related to the origin of the isolates. There were three main colony colour types. Temperature was the main factor affecting colony morphology in vitro. The formation of sectors was observed in 36% of colonies, pseudoparenchymatous stromata in 10.4% of colonies, and white crystalline substances in 53.3% of colonies. The results of in vitro observations were used for discussion of the effects of temperature on growth and activity of C. fraxinea in vivo.
Źródło:
Acta Agrobotanica; 2010, 63, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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