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<p><i>Cinnamomum balansae</i> is grown in plantations in northern Vietnam for its fine timber and essential oils. However, plantations are vulnerable to diseases. Our study recorded canker and wilt diseases with symptoms of stem cankers, discolored bark and wood, wilting canopies, and tree death in plantations. The 16-year-old trees in plantations were seriously damaged with disease incidence of 30.2%. ITS, β-tubulin, and EF1-α gene sequencing confirmed that the pathogen causing canker and wilt diseases in <i>C. balansae</i> in Hoa Binh province, Vietnam was <i>Ceratocystis fimbriata</i>. Strains of the pathogen had strong pathogenicity on <i>C. balansae</i> seedlings in an inoculation trial in a nursery. There were significant provenance differences in disease tolerance, with the Thanh Hoa provenance having the lowest lesion length (L = 2.25&#xa0;cm), mortality (D = 6.7%) and the highest tolerance to <i>C. fimbriata</i>. The Phu Tho provenance and commercial seedlings were susceptible to the pathogen with L = 14.6–17.1&#xa0;cm, D = 46.7–63.3% and had very low disease tolerance. The tolerant provenance provides a scientific basis for the selection of disease-tolerant varieties in the future. Furthermore, to minimize damage to existing <i>C. balansae</i> plantations, appropriate management solutions need to be identified and implemented.</p>

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Canker and wilt diseases in Cinnamomum balansae: identification, pathogenicity and host tolerance

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Le Van Quang,
  • Hoang Van Thang,
  • Dang Thi Kim Anh,
  • Tran Pham Minh Chau,
  • Nguyen Minh Chi

摘要

Cinnamomum balansae is grown in plantations in northern Vietnam for its fine timber and essential oils. However, plantations are vulnerable to diseases. Our study recorded canker and wilt diseases with symptoms of stem cankers, discolored bark and wood, wilting canopies, and tree death in plantations. The 16-year-old trees in plantations were seriously damaged with disease incidence of 30.2%. ITS, β-tubulin, and EF1-α gene sequencing confirmed that the pathogen causing canker and wilt diseases in C. balansae in Hoa Binh province, Vietnam was Ceratocystis fimbriata. Strains of the pathogen had strong pathogenicity on C. balansae seedlings in an inoculation trial in a nursery. There were significant provenance differences in disease tolerance, with the Thanh Hoa provenance having the lowest lesion length (L = 2.25 cm), mortality (D = 6.7%) and the highest tolerance to C. fimbriata. The Phu Tho provenance and commercial seedlings were susceptible to the pathogen with L = 14.6–17.1 cm, D = 46.7–63.3% and had very low disease tolerance. The tolerant provenance provides a scientific basis for the selection of disease-tolerant varieties in the future. Furthermore, to minimize damage to existing C. balansae plantations, appropriate management solutions need to be identified and implemented.