<i>Pseudodidymella fagi</i> in Slovakia: First detection, morphology and culture characteristics

Czachura, Paweł; Owczarek‐Kościelniak, Magdalena; Piątek, Marcin

doi:10.1111/efp.12479

Cited by 2 publications

(6 citation statements)

References 28 publications

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“…Ascospores were 17.4-25.5 (ø = 21.6) µm long and 4.0-6.5 (ø = 5.5) µm wide, hyaline, mostly 1-septate, constricted at the septum, distinctly pointed but rounded at the apex (Figure 2k). Morphological identification corresponded to the description of Pseudodidymella fagi [1,2,4,7].…”

Section: Distribution and Identification Of Pseudodidymella Fagimentioning

confidence: 83%

“…In 2016, P. fagi was also identified in southern Germany on F. sylvatica and on Oriental beech (Fagus orientalis Lipsky) in the Munich Botanical Garden [2] and in Austria [3]. In 2017, the disease was recorded in Slovakia [4]. Reports of P. fagi spread in Europe indicate that it possesses the fundamental characteristics of an invasive alien species.…”

Section: Introductionmentioning

confidence: 99%

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Pseudodidymella fagi in Slovenia: First Report and Expansion of Host Range

Ogris

Brglez

Piškur

2019

Forests

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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.

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Section: Distribution and Identification Of Pseudodidymella Fagimentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Pseudodidymella fagi in Slovenia: First Report and Expansion of Host Range

Ogris

Brglez

Piškur

2019

Forests

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“…fagi" have identical sequences and cannot be separated from each other (comp. Gross et al 2017 andCzachura et al 2018). Petrakia echinata and P. greenei also do not differ in their ITSsequences.…”

Section: Blast Search and Sequence Comparisonmentioning

confidence: 92%

“…fagi differ consistently only in one base pair (comp. Czachura et al 2018). The LSU sequences of the Japanese Ps.…”

Section: Blast Search and Sequence Comparisonmentioning

confidence: 99%

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Phylogenetic revision of Petrakia and Seifertia (Melanommataceae, Pleosporales): new and rediscovered species from Europe and North America

2020

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The phylogenetic revision of the genera Petrakia and Seifertia using LSU, ITS, RPB2 and TEF1 sequences and the re-evaluation of their morphological characteristics lead to several reclassifications: The genus Pseudodidymella as well as the genera Mycodidymella and Xenostigmina are synonymized with the genus Petrakia. Based on ITS sequence comparisons, it was previously suspected that the leaf spot pathogen Pseudodidymella fagi, which occurs on the Japanese beech Fagus crenata in Japan, is conspecific to the pathogen attacking the European beech Fagus sylvatica in Switzerland and Germany since 2008.Herein, we show that Japanese and European collections represent separate species and describe the European one as Petrakia liobae new to science. Apart from that, we make the new combinations Petrakia fagi and Petrakia minima. The names Petrakia aesculi and Petrakia aceris are validated. A sixty-year-old collection from Wisconsin USA, designated as Petrakia echinata on leaves of silver maple (Acer saccharinum), proved to be another species new to science and is described here as Petrakia greenei. Consequently, there is currently no evidence of the European P. echinata to occur in North America. In contrast, P. echinata was found to infect the North American big leaf maple (Acer macrophyllum) in Europe. Antromycopsis alpina, described in 1914, was rediscovered in the Swiss Alps from dry fruits of Rhododendron ferrugineum. It is combined in Seifertia as S. alpina, based on molecular Manuscript Click here to access/download;Manuscript;Beenken_et_al_MS_Petrakia_an Click here to view linked References

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Pseudodidymella fagi in Slovakia: First detection, morphology and culture characteristics

Cited by 2 publications

References 28 publications

Pseudodidymella fagi in Slovenia: First Report and Expansion of Host Range

Pseudodidymella fagi in Slovenia: First Report and Expansion of Host Range

Phylogenetic revision of Petrakia and Seifertia (Melanommataceae, Pleosporales): new and rediscovered species from Europe and North America

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