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<p>Dragon fruit (<i>Hylocereus polyrhizus</i>) is an herbaceous perennial climbing cactus species belonging to the family Cactaceae and commonly known as Pithaya, Strawberry Pear, Night Blooming Cereus, Belle of the night, Jesus in the Cradle and recently named <i>‘Kamalam’</i> in India. In July 2022, severe stem rot symptoms were observed on dragon fruit plants grown at the Horticulture (25⁰40’59’’N, 91⁰54’47’’E) and Plant Pathology (25⁰39’45’’N, 91⁰53’37’’E) Experimental Farms of ICAR-Research Complex for North Eastern Hill Region, Umiam, Meghalaya, India. Infected stems showed circular rot, brown sunken lesions, sporodochia with orange masses of conidia, and white mycelium developed in the lesion. The associated fungus (DFSR-1) was isolated on potato dextrose agar (PDA), producing fluffy colony, whitish mycelial growth with irregular margins and a radial growth rate of 0.45&#xa0;cm/day was observed, with development of a white cream pigmentation on the back side of plate. Pathogenicity test produced an identical symptom with natural infection, henceforth fulfilling Koch’s postulates. Based on morphological characteristics, DNA sequences and phylogenetic analysis of genomic regions for ITS (PX599360), TEF-1(PX990095) and RPB2 (PX990096), the fungal isolate (DFSR-1) was identified as <i>Fusarium longifundum</i>. To the best of our knowledge, this study represents the first documented report of <i>F. longifundum</i> causing stem rot on red flesh dragon fruit in India, thereby broadening the pathogen’s known host spectrum and emphasizing the urgency for effective disease management strategies.</p>

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First record of Fusarium longifundum causing stem rot of red fleshed dragon fruit (Hylocereus polyrhizus) in India

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Om Prakash,
  • Shruti Sinha,
  • Tasvina R. Borah,
  • Pankaj Baiswar,
  • Kennedy Ningthoujam,
  • Dwipendra Thakuria,
  • Ankit Alok,
  • Sushanti Thokchom,
  • Deepu Kumar,
  • Baby Wangkhem,
  • Akoijam Ratankumar Singh

摘要

Dragon fruit (Hylocereus polyrhizus) is an herbaceous perennial climbing cactus species belonging to the family Cactaceae and commonly known as Pithaya, Strawberry Pear, Night Blooming Cereus, Belle of the night, Jesus in the Cradle and recently named ‘Kamalam’ in India. In July 2022, severe stem rot symptoms were observed on dragon fruit plants grown at the Horticulture (25⁰40’59’’N, 91⁰54’47’’E) and Plant Pathology (25⁰39’45’’N, 91⁰53’37’’E) Experimental Farms of ICAR-Research Complex for North Eastern Hill Region, Umiam, Meghalaya, India. Infected stems showed circular rot, brown sunken lesions, sporodochia with orange masses of conidia, and white mycelium developed in the lesion. The associated fungus (DFSR-1) was isolated on potato dextrose agar (PDA), producing fluffy colony, whitish mycelial growth with irregular margins and a radial growth rate of 0.45 cm/day was observed, with development of a white cream pigmentation on the back side of plate. Pathogenicity test produced an identical symptom with natural infection, henceforth fulfilling Koch’s postulates. Based on morphological characteristics, DNA sequences and phylogenetic analysis of genomic regions for ITS (PX599360), TEF-1(PX990095) and RPB2 (PX990096), the fungal isolate (DFSR-1) was identified as Fusarium longifundum. To the best of our knowledge, this study represents the first documented report of F. longifundum causing stem rot on red flesh dragon fruit in India, thereby broadening the pathogen’s known host spectrum and emphasizing the urgency for effective disease management strategies.