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<p>From 2020 to 2024, widespread outbreaks of leaf blight severely affected rose-scented <i>Pelargonium</i> cultivation in China, leading to considerable declines in essential oil production and substantial economic losses. To identify the pathogen species responsible for leaf blight in rose-scented <i>Pelargonium</i> and screen for control agents, typical samples of rose-scented <i>Pelargonium</i> affected by leaf blight were collected from the major aromatic plant-growing region. Pathogenic fungi were isolated and purified from the diseased samples, after which their morphological characteristics, molecular biological characteristics and pathogenicity were determined. Combined morphological and multigene phylogenetic analysis (GADPH-ACT-ITS-CHS1-TUB2) of the fungal isolates revealed that the main pathogen was <i>Colletotrichum nymphaeae</i>, a member of the <i>C. acutatum</i> species complex. Pathogenicity analyses of four <i>Pelargonium</i> species revealed that <i>C. nymphaeae</i> leaf blight symptoms were present exclusively in <i>P. × hybridum</i> cv. ‘Rosat Chine’ but not in <i>Pelargonium domesticum</i> Bailey, <i>P. zonale</i> Aif., or <i>P. peltatum</i> (L.) Ait. Antifungal activity assays demonstrated that 80% ethylicin EC exhibited the strongest inhibitory activity against <i>C. nymphaeae</i> mycelial growth, achieving 100% inhibition at 10&#xa0;µg/mL. In living potted plant assays, 80% ethylicin EC also resulted in the highest disease control efficacy, with up to 88.51% inhibition, followed by 45% misonidazole EW, which resulted in 65.52% inhibition. This study identified the causative agent of rose-scented <i>Pelargonium</i> leaf blight as <i>C. nymphaeae</i> and provides basic information for the management of this disease.</p>

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Colletotrichum nymphaeae causes leaf blight in rose-scented Pelargonium in China

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Jiabao Wei,
  • Ran Tang,
  • Jicheng Gu,
  • Qiaoxia Shang,
  • Linfang Long,
  • Yan Chen

摘要

From 2020 to 2024, widespread outbreaks of leaf blight severely affected rose-scented Pelargonium cultivation in China, leading to considerable declines in essential oil production and substantial economic losses. To identify the pathogen species responsible for leaf blight in rose-scented Pelargonium and screen for control agents, typical samples of rose-scented Pelargonium affected by leaf blight were collected from the major aromatic plant-growing region. Pathogenic fungi were isolated and purified from the diseased samples, after which their morphological characteristics, molecular biological characteristics and pathogenicity were determined. Combined morphological and multigene phylogenetic analysis (GADPH-ACT-ITS-CHS1-TUB2) of the fungal isolates revealed that the main pathogen was Colletotrichum nymphaeae, a member of the C. acutatum species complex. Pathogenicity analyses of four Pelargonium species revealed that C. nymphaeae leaf blight symptoms were present exclusively in P. × hybridum cv. ‘Rosat Chine’ but not in Pelargonium domesticum Bailey, P. zonale Aif., or P. peltatum (L.) Ait. Antifungal activity assays demonstrated that 80% ethylicin EC exhibited the strongest inhibitory activity against C. nymphaeae mycelial growth, achieving 100% inhibition at 10 µg/mL. In living potted plant assays, 80% ethylicin EC also resulted in the highest disease control efficacy, with up to 88.51% inhibition, followed by 45% misonidazole EW, which resulted in 65.52% inhibition. This study identified the causative agent of rose-scented Pelargonium leaf blight as C. nymphaeae and provides basic information for the management of this disease.