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<p><i>Pythium aphanidermatum</i> is an important pathogen in several coriander (<i>Coriandrum sativum</i>)–producing regions, as it causes damping-off in seedlings and stem and root rot, often leading to plant death. Therefore, this study evaluated biological and chemical products for the control of root rot in coriander. An in vitro paired-culture assay was conducted using two <i>Trichoderma</i> species (<i>Trichoderma</i> sp. and <i>Trichoderma harzianum</i>) against <i>P. aphanidermatum</i>. In addition, effects of potassium phosphite, <i>Melaleuca alternifolia</i> extract, fosetyl-Al, <i>Bacillus subtilis</i>, and <i>Lactobacillus plantarum</i> + <i>Saccharomyces cerevisiae</i> were assessed at concentrations of 0, 10, 100, 500, and 1000&#xa0;mg L⁻<sup>1</sup> in PDA medium on mycelial growth of the oomycete. Experiments followed a completely randomized design. Subsequently, a greenhouse experiment was performed using coriander plants inoculated with <i>P. aphanidermatum</i> as a control and plants treated with the biological and chemical products evaluated in vitro. Selected morphophysiological variables were then analyzed. Both <i>Trichoderma</i> species and all tested products significantly inhibited mycelial growth of <i>P. aphanidermatum</i>. Among treatments, <i>Melaleuca alternifolia</i> extract showed the greatest efficacy, reducing disease incidence and post-emergence damping-off while enhancing gas exchange, resulting in greater plant growth and increased fresh mass accumulation in roots and shoots.</p>

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Biological and chemical products alter plant growth and control Pythium aphanidermatum in coriander

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Eveline Mendes da Silva,
  • Poliana Prates de Souza Soares,
  • Naasoom Luiz Santos Mesquita,
  • Natália Deniz Brito,
  • Leandro Dias da Silva,
  • Quelmo Silva de Novaes,
  • Armínio Santos,
  • Rafael José Vilela de Oliveira

摘要

Pythium aphanidermatum is an important pathogen in several coriander (Coriandrum sativum)–producing regions, as it causes damping-off in seedlings and stem and root rot, often leading to plant death. Therefore, this study evaluated biological and chemical products for the control of root rot in coriander. An in vitro paired-culture assay was conducted using two Trichoderma species (Trichoderma sp. and Trichoderma harzianum) against P. aphanidermatum. In addition, effects of potassium phosphite, Melaleuca alternifolia extract, fosetyl-Al, Bacillus subtilis, and Lactobacillus plantarum + Saccharomyces cerevisiae were assessed at concentrations of 0, 10, 100, 500, and 1000 mg L⁻1 in PDA medium on mycelial growth of the oomycete. Experiments followed a completely randomized design. Subsequently, a greenhouse experiment was performed using coriander plants inoculated with P. aphanidermatum as a control and plants treated with the biological and chemical products evaluated in vitro. Selected morphophysiological variables were then analyzed. Both Trichoderma species and all tested products significantly inhibited mycelial growth of P. aphanidermatum. Among treatments, Melaleuca alternifolia extract showed the greatest efficacy, reducing disease incidence and post-emergence damping-off while enhancing gas exchange, resulting in greater plant growth and increased fresh mass accumulation in roots and shoots.