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<p>Elm trees (<i>Ulmus</i> sp.) occurring naturally or planted as ornamentals in Europe are susceptible to powdery mildew (PM). In the past, the causal agent of the powdery mildew symptoms on the adaxial side of leaves of <i>Ulmus</i> trees was <i>Erysiphe ulmi</i> in Hungary. However, we identified <i>E. kenjiana</i> on <i>Ulmus pumila</i> leaves sampled from the urban area of Budapest. Identification was based on morphological characteristics and molecular phylogenetic analysis. Numerous spherical chasmothecia, which were 58–94&#xa0;µm in diameter, were found on the samples. The apices of the appendages were characteristically spirally twisted and flattened. Anamorphs were found only on one sample, characterized by conidiophores developing ellipsoid–cylindrical conidia singly. The mycelium was epiphytic with lobed to multilobed hyphal appressoria, mostly in opposite pairs. The internal transcribed spacer region (ITS) of the nrDNA was amplified, and the BLAST search showed 100% similarity with <i>E. kenjiana</i> sequences in GenBank. In the maximum likelihood phylogenetic analysis, the sequences of the Hungarian samples grouped in one clade with the sequences of other <i>E. kenjiana</i> specimens collected in Europe and Asia. This is the first report of the non-native <i>E. kenjiana</i> causing powdery mildew on <i>Ulmus pumila</i> in Hungary.</p>

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Erysiphe kenjiana: a newly arrived alien species causing powdery mildew on Ulmus trees in Hungary

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月7日

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  • Orsolya Molnár,
  • Diána Seress,
  • Katalin Borostyán,
  • Alexandra Pintye,
  • Márk Z. Németh

摘要

Elm trees (Ulmus sp.) occurring naturally or planted as ornamentals in Europe are susceptible to powdery mildew (PM). In the past, the causal agent of the powdery mildew symptoms on the adaxial side of leaves of Ulmus trees was Erysiphe ulmi in Hungary. However, we identified E. kenjiana on Ulmus pumila leaves sampled from the urban area of Budapest. Identification was based on morphological characteristics and molecular phylogenetic analysis. Numerous spherical chasmothecia, which were 58–94 µm in diameter, were found on the samples. The apices of the appendages were characteristically spirally twisted and flattened. Anamorphs were found only on one sample, characterized by conidiophores developing ellipsoid–cylindrical conidia singly. The mycelium was epiphytic with lobed to multilobed hyphal appressoria, mostly in opposite pairs. The internal transcribed spacer region (ITS) of the nrDNA was amplified, and the BLAST search showed 100% similarity with E. kenjiana sequences in GenBank. In the maximum likelihood phylogenetic analysis, the sequences of the Hungarian samples grouped in one clade with the sequences of other E. kenjiana specimens collected in Europe and Asia. This is the first report of the non-native E. kenjiana causing powdery mildew on Ulmus pumila in Hungary.