Search the repository

A+ | A- | | SLO | ENG

Abstract: The fungus Pseudodidymella fagi is spreading in Europe and causing leaf blotch of European beech, Fagus sylvatica. Between 2008 and 2017, outbreaks of P. fagi were observed on European beech in Switzerland, Germany (also on F. orientalis), Austria, and Slovakia. In Slovenia, leaf blotch symptoms were first observed on F. sylvatica in 2018. P. fagi was identified as the causal agent of the observed symptoms in Slovenia by morphological examinations together with sequencing of the internal transcribed spacer (ITS) region of the rDNA. This study links the fungus to the expansion of the known distribution of the disease to Slovenia, and based on in vitro pathogenicity trials, also to a new potential host, Quercus petraea. The pathogenicity tests confirmed F. sylvatica and F. orientalis as hosts for P. fagi, but not Castanea sativa, where pathogenicity to F. orientalis was proved for first time in vitro. Although Koch%s postulates could not be proven for C. sativa, it seems to be partially susceptible in vitro because some of the inoculation points developed lesions. Additionally, damage to Carpinus betulus related to P. fagi near heavily infected beech trees was observed in vivo but was not tested in laboratory trials. Based on the results and our observations in the field, it is likely that P. fagi has a wider host range than previously thought and that we might be witnessing host switching.
Keywords: Pycnopleiospora fagi, leaf blotch, pathogenicity test, inoculation test, Fagus orientalis, Fagus sylvatica, Quercus petraea, mycopappus-like propagule, Carpinus betulus, host switching
Published in DiRROS: 23.08.2019; Views: 2457; Downloads: 1544
Full text (4,90 MB)
This document has many files! More...

Abstract: Veliki rastlinojedi parkljarji (VRP) različno vplivajo na razvoj gozdnih ekosistemov. Eden izmed najbolj negativnih vplivov, ki ga imajo na dolgoročni razvoj gozdov, je posledica kroničnega čezmernega objedanja mladja. Namen raziskave je bil s pomočjo analize objedanja v delu dinarskih jelovo-bukovih gozdov ugotoviti, kakšen vpliv na intenzivnost objedanja imajo habitatne značilnosti prostora in relief. Povprečna objedenost mladja je bila 70 %, analiza višinske strukture mladja pa je pokazala, da ni prehajanja gorskega javorja in jelke v zgornje višinske plasti. Potrdili smo vpliv stopnje kritja za VRP in reliefa na stopnjo objedenosti. Največ poškodb smo zabeležili na grebenih in v vrtačah. Glede na rezultate naših analiz v prihodnje v jelovobukovih gozdovih na območju naše raziskave ne bo mogoče zagotoviti primesi jelke in gorskega javorja v zgornjih sestojnih položajih. Če želimo v tem delu Slovenije vzgojiti pestre gozdove, bo poleg gozdno-gojitvenega ukrepanja nujno nadaljevanje intenzivnega gospodarjenja z VRP v smislu zmanjševanja njihovih gostot.
Keywords: objedanje, gojenje gozdov, veliki rastlinojedi parkljarji, relief, pomlajevanje, Abies alba, Fagus sylvatica, Acer pseudoplatanus
Published in DiRROS: 08.07.2019; Views: 7013; Downloads: 2929
Link to full text
This document has many files! More...

Keywords: varstvo gozdov, navadna bukev, Fagus sylvatica, Pseudodidymella fagi, listi
Published in DiRROS: 05.06.2019; Views: 2412; Downloads: 126
This document has many files! More...

Keywords: varstvo gozdov, navadna bukev, Fagus sylvatica, Pseudodidymella fagi, listi
Published in DiRROS: 05.06.2019; Views: 2142; Downloads: 126
This document has many files! More...

Keywords: varstvo gozdov, navadna bukev, Fagus sylvatica, Pseudodidymella fagi, listi
Published in DiRROS: 05.06.2019; Views: 1889; Downloads: 122
This document has many files! More...