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<p><i>Auricularia polytricha</i> in the Hainan region frequently suffers from green mold disease, leading to symptoms such as whitening, collapse, and rot, which significantly reduces its yield and quality. However, the specific pathogen causing this disease and its ecological adaptation characteristics remain unclear, which hinders the development of targeted prevention and control strategies. Therefore, this study aims to identify the causal agent, analyze its biological characteristics, and establish a robust theoretical basis for precise control. Strain 1&#xa0;A, isolated from diseased tissue, was used as the research subject. Its pathogenicity was first verified according to Koch’s postulates. Through morphological analysis and phylogenetic tree construction using the Internal Transcribed Spacer (ITS) gene, the pathogen was identified as <i>Trichoderma pleuroticola</i>. Subsequently, its growth characteristics were analyzed via single-factor experiments under various conditions. The results revealed that optimal growth occurred with maltose as the carbon source, ammonium sulfate as the nitrogen source, total darkness, a pH of 5, and a temperature of 30&#xa0;°C. These conditions are highly consistent with Hainan’s high-temperature, high-humidity climate, acidic soils, and the microenvironment of host wounds. This study is the first to definitively identify the pathogen of green mold disease on <i>A. polytricha</i> in Hainan and characterized its fundamental biological traits. These findings on its optimal growth conditions provide a foundational theory and basis for subsequent research into the disease’s occurrence and prevalence patterns in the field, as well as for formulating ecology-based prevention and control strategies through environmental management.</p>

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Biological traits of the pathogen causing trichoderma rot on Auricularia polytricha in Hainan and its identification

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Bixian Yao,
  • Xudong Yu,
  • Biyuan Yao,
  • Yiming Chai,
  • Haoyu Du,
  • Can Luo

摘要

Auricularia polytricha in the Hainan region frequently suffers from green mold disease, leading to symptoms such as whitening, collapse, and rot, which significantly reduces its yield and quality. However, the specific pathogen causing this disease and its ecological adaptation characteristics remain unclear, which hinders the development of targeted prevention and control strategies. Therefore, this study aims to identify the causal agent, analyze its biological characteristics, and establish a robust theoretical basis for precise control. Strain 1 A, isolated from diseased tissue, was used as the research subject. Its pathogenicity was first verified according to Koch’s postulates. Through morphological analysis and phylogenetic tree construction using the Internal Transcribed Spacer (ITS) gene, the pathogen was identified as Trichoderma pleuroticola. Subsequently, its growth characteristics were analyzed via single-factor experiments under various conditions. The results revealed that optimal growth occurred with maltose as the carbon source, ammonium sulfate as the nitrogen source, total darkness, a pH of 5, and a temperature of 30 °C. These conditions are highly consistent with Hainan’s high-temperature, high-humidity climate, acidic soils, and the microenvironment of host wounds. This study is the first to definitively identify the pathogen of green mold disease on A. polytricha in Hainan and characterized its fundamental biological traits. These findings on its optimal growth conditions provide a foundational theory and basis for subsequent research into the disease’s occurrence and prevalence patterns in the field, as well as for formulating ecology-based prevention and control strategies through environmental management.