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<p><i>Sesbania bispinosa</i> (Jacq.) W. Wight (Fabaceae), also known as Dhaincha, is a popular nitrogen-fixing green manure crop to improve soil fertility. Between July and September during the years 2022 to 2024, symptoms of wilting with necrotic lesions and rotting at the collar region were observed on dhaincha plants grown in the experimental fields of the ICAR-Central Potato Research Institute Regional Station, Meerut, Uttar Pradesh, India. The causing agent was isolated on potato dextrose agar (PDA), exhibiting fluffy white mycelium with dark brown scattered sclerotia. Pathogenicity assays successfully reproduced identical wilting symptoms, thereby fulfilling Koch’s postulates. Molecular identification using rDNA-ITS sequencing (GenBank Accession No. PX251733 and PX251734) and <i>tef-1α</i> gene sequencing (GenBank Accession No. PX250990) confirmed <i>Agroathelia rolfsii</i> as the causal agent. To the best of our knowledge, this is the first report of collar and stem rot disease of <i>Sesbania bispinosa</i> caused by <i>Agroathelia rolfsii</i> in India. These findings provide important insights into the expanded host range and will aid in designing effective crop rotation strategies within diverse cropping systems.</p>

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First report of Agroathelia rolfsii (= Sclerotium rolfsii Sacc.) causing collar and stem rot disease of dhaincha (Sesbania bispinosa) in India

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Mehi Lal,
  • Sanjeev Sharma,
  • Ajay Kumar Thakur,
  • Sorabh Chaudhary,
  • R. K. Singh

摘要

Sesbania bispinosa (Jacq.) W. Wight (Fabaceae), also known as Dhaincha, is a popular nitrogen-fixing green manure crop to improve soil fertility. Between July and September during the years 2022 to 2024, symptoms of wilting with necrotic lesions and rotting at the collar region were observed on dhaincha plants grown in the experimental fields of the ICAR-Central Potato Research Institute Regional Station, Meerut, Uttar Pradesh, India. The causing agent was isolated on potato dextrose agar (PDA), exhibiting fluffy white mycelium with dark brown scattered sclerotia. Pathogenicity assays successfully reproduced identical wilting symptoms, thereby fulfilling Koch’s postulates. Molecular identification using rDNA-ITS sequencing (GenBank Accession No. PX251733 and PX251734) and tef-1α gene sequencing (GenBank Accession No. PX250990) confirmed Agroathelia rolfsii as the causal agent. To the best of our knowledge, this is the first report of collar and stem rot disease of Sesbania bispinosa caused by Agroathelia rolfsii in India. These findings provide important insights into the expanded host range and will aid in designing effective crop rotation strategies within diverse cropping systems.