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<p>Strawberry leaf anthracnose (SLA) is an emerging threat in Vietnam’s primary strawberry-growing region. This study investigated the occurrence, etiology, and cultivar susceptibility in Lam Dong Province. Field surveys across 27 farms in three wards of Da Lat City revealed necrotic leaf spots and stem reddening, with mean incidence reached 6.3% on leaves and 2.8% on petioles, and an average severity of 10.4%. SLA distribution varied by location, with higher leaf infection in ward 7 and greater petiole involvement in ward 3. Statistical analysis indicated that mulch use was associated with a significant increase in leaf disease severity, whereas other agronomic practices showed no consistent effect on SLA incidence. A total of 27 <i>Colletotrichum</i> isolates were recovered from symptomatic tissues, and 7 representative isolates were tested for pathogenicity on detached leaves, of which some produced symptoms, showing variable aggressiveness. Multilocus phylogenetic analysis of two representative isolates (C1P8 and C1P3) using <i>ITS</i>,<i> TUB2</i>,<i> GAPDH</i>,<i> ACT</i>,<i> CHS-1</i>, and <i>HIS3</i> sequences identified the causal agent as <i>Colletotrichum nymphaeae</i>, representing the first report of this pathogen on strawberry in Vietnam. Screening of seven strawberry cultivars with the most aggressive isolate (C1P8) revealed significant differences in susceptibility: <i>‘Seolhyang’</i> and <i>‘Skyberry’</i> were highly resistant, whereas ‘<i>Pajaro’</i> was the most susceptible. These findings highlight the combined roles of pathogen virulence and host genotype in SLA development and support the use of resistant cultivars for integrated disease management. This study contributes to regional pathogen surveillance efforts and supports phytosanitary measures against <i>C. nymphaeae</i> in Southeast Asian strawberry systems.</p>

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Emergence of Colletotrichum nymphaeae in Vietnam: etiology and cultivar response to strawberry leaf anthracnose

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Dung Le,
  • An Thuy Bui,
  • Huynh Duy Tran,
  • Hoa Thi Kim Thuan Nguyen

摘要

Strawberry leaf anthracnose (SLA) is an emerging threat in Vietnam’s primary strawberry-growing region. This study investigated the occurrence, etiology, and cultivar susceptibility in Lam Dong Province. Field surveys across 27 farms in three wards of Da Lat City revealed necrotic leaf spots and stem reddening, with mean incidence reached 6.3% on leaves and 2.8% on petioles, and an average severity of 10.4%. SLA distribution varied by location, with higher leaf infection in ward 7 and greater petiole involvement in ward 3. Statistical analysis indicated that mulch use was associated with a significant increase in leaf disease severity, whereas other agronomic practices showed no consistent effect on SLA incidence. A total of 27 Colletotrichum isolates were recovered from symptomatic tissues, and 7 representative isolates were tested for pathogenicity on detached leaves, of which some produced symptoms, showing variable aggressiveness. Multilocus phylogenetic analysis of two representative isolates (C1P8 and C1P3) using ITS, TUB2, GAPDH, ACT, CHS-1, and HIS3 sequences identified the causal agent as Colletotrichum nymphaeae, representing the first report of this pathogen on strawberry in Vietnam. Screening of seven strawberry cultivars with the most aggressive isolate (C1P8) revealed significant differences in susceptibility: ‘Seolhyang’ and ‘Skyberry’ were highly resistant, whereas ‘Pajaro’ was the most susceptible. These findings highlight the combined roles of pathogen virulence and host genotype in SLA development and support the use of resistant cultivars for integrated disease management. This study contributes to regional pathogen surveillance efforts and supports phytosanitary measures against C. nymphaeae in Southeast Asian strawberry systems.