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<p>In October 2023, mass mortality of 10 commercial <i>Eucalyptus</i> clones due to an unknown etiological agent was observed in Dehradun, northern India. A thorough examination of the affected clones revealed stem necrosis, leading to wilt and shepherd’s crook symptoms. Repeated isolations from the symptomatic stems yielded a <i>Colletotrichum</i> species identified based on morphological characters. Phylogenetic analyses, utilizing the internal transcribed spacer and three partial gene regions (β-tubulin, glyceraldehyde-3-phosphate dehydrogenase and actin), confirmed the species as <i>Colletotrichum fructicola</i>. Stem inoculations with <i>C. fructicola</i> induced disease symptoms similar to those observed on naturally infected plants. The pathogen was subsequently re-isolated from the inoculated plants, fulfilling Koch’s postulates. This study represents the first documented instance of <i>C. fructicola</i> causing significant mortality in juvenile <i>Eucalyptus</i> clones (6-month-old) in India. These findings offer valuable insights for devising effective disease management strategies to mitigate the impact of this destructive pathogen.</p>

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Morphology and phylogeny revealed Colletotrichum fructicola causing new disease symptoms on Eucalyptus in India

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Nitika Negi,
  • Ramkrishna,
  • Sabyasachi Banerjee,
  • Rajendra K. Meena,
  • Maneesh S. Bhandari,
  • Shailesh Pandey

摘要

In October 2023, mass mortality of 10 commercial Eucalyptus clones due to an unknown etiological agent was observed in Dehradun, northern India. A thorough examination of the affected clones revealed stem necrosis, leading to wilt and shepherd’s crook symptoms. Repeated isolations from the symptomatic stems yielded a Colletotrichum species identified based on morphological characters. Phylogenetic analyses, utilizing the internal transcribed spacer and three partial gene regions (β-tubulin, glyceraldehyde-3-phosphate dehydrogenase and actin), confirmed the species as Colletotrichum fructicola. Stem inoculations with C. fructicola induced disease symptoms similar to those observed on naturally infected plants. The pathogen was subsequently re-isolated from the inoculated plants, fulfilling Koch’s postulates. This study represents the first documented instance of C. fructicola causing significant mortality in juvenile Eucalyptus clones (6-month-old) in India. These findings offer valuable insights for devising effective disease management strategies to mitigate the impact of this destructive pathogen.