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<p><i>Deutzia</i> species are beautiful blooming plants introduced as ornamental shrubs to different European countries from their native range. These shrubs are known hosts of powdery mildew and are parasitised worldwide by three <i>Erysiphe</i> species. In Romania, powdery mildew symptoms were first observed in 2022 on the leaves of several <i>Deutzia scabra</i> shrubs growing in public green spaces in the city of Piatra Neamț. The pathogen was identified as <i>Erysiphe deutziana</i> by examining the morphology of its asexual stage (the sexual stage was not found), verifying its association with <i>Deutzia scabra</i> and by comparing ITS and LSU sequences from a Romanian sample with those available in GenBank. Pathogenicity tests on healthy plants confirmed that <i>Erysiphe deutziana</i> was the causal agent of the powdery mildew. The identity of the fungus that developed on the inoculated plants was confirmed by comparing disease symptoms and morphology, and by obtaining identical ITS sequences from both the inoculum and the powdery mildew produced during the pathogenicity test. To date, no powdery mildew has been reported on <i>Deutzia</i> species in Romania.</p>

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Identification of powdery mildew on Deutzia scabra in Romania using Erysiphales-specific nuclear ribosomal RNA sequencing

  • 期刊论文

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  • 发表日期：

    2026年3月25日

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  • Vasilică-Claudiu Chinan,
  • Maria-Magdalena Dascălu,
  • Ciprian Claudiu Mânzu

摘要

Deutzia species are beautiful blooming plants introduced as ornamental shrubs to different European countries from their native range. These shrubs are known hosts of powdery mildew and are parasitised worldwide by three Erysiphe species. In Romania, powdery mildew symptoms were first observed in 2022 on the leaves of several Deutzia scabra shrubs growing in public green spaces in the city of Piatra Neamț. The pathogen was identified as Erysiphe deutziana by examining the morphology of its asexual stage (the sexual stage was not found), verifying its association with Deutzia scabra and by comparing ITS and LSU sequences from a Romanian sample with those available in GenBank. Pathogenicity tests on healthy plants confirmed that Erysiphe deutziana was the causal agent of the powdery mildew. The identity of the fungus that developed on the inoculated plants was confirmed by comparing disease symptoms and morphology, and by obtaining identical ITS sequences from both the inoculum and the powdery mildew produced during the pathogenicity test. To date, no powdery mildew has been reported on Deutzia species in Romania.