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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Analýza vnitrodruhové proměnlivosti jasanu ve vztahu k jeho chřadnutí
 Bohdálek, Michal
Population of common (Fraxinus excelsior L.) and narrow-leaved ash (Fraxinus angustifolia Vahl.) in Europe are currently haunted by the pathogenic fungus Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz & Hosoya, originating in the Far East. The objective of present study is to analyze whether and how the provenance of reproductive material influences the tolerance of the both ash species against this invasive pathogen. Our study was carried out in the research plot Zámeček near Kroměříž with 16 provenances of common ash from all of the Czech Republic and 2 provenances of narrow-leaved ash from the Morava valley at the age of 22 years. The experiment was established by the Forestry and Game Research Institute in Jíloviště-Strnady. In the field, we measured height and diameter, and assessed the stem quality, bud burst and intensity of infection by H. fraxineus (using a certified methodology) of individual trees and provenances. Then, we analyzed mutual relationships of the growth, morphology, phenology and intensity of infection. It resulted in interesting findings: we found provenances of common ash originating from more northerly localities (higher latitude) less intensively infected by H. fraxineus and flushing later than others. Less infected individuals were higher and had better stem quality at the same time. It is interesting that provenances from warmer sites revealed bigger breast-height diameter.
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