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<p>Chemical herbicides are facing increasing challenges due to the evolution of resistance and environmental concerns, prompting interest in plant-derived allelochemicals for sustainable weed control. This study evaluated the essential oils (EOs) of <i>Hedychium forrestii</i> leaves (HFLEO) and rhizomes (HFREO) as a potential natural phytotoxic agent against barnyard grass (<i>Echinochloa crus-galli</i>) and weedy rice<b> (</b><i>Oryza sativa f.</i> <i>spontanea)</i>, two invasive weed species in rice production. The EOs were hydrodistilled (yields: 0.26% for HFLEO and 0.45% for HFREO), and analyzed chemical composition by GC–MS, and then tested in dose–response bioassays (0–16 µL/mL). The most abundant compound in both EOs was β-pinene (23.78–24.85%), followed by 1,8-cineol and α-pinene. Both EOs inhibited <i>E. crus-galli</i> growth dose-dependently, with HFLEO showing superior efficacy at 4 µL/mL (89.42% shoot, 96.91% root inhibition). Complete growth suppression (100%) occurred at ≥ 8 µL/mL for <i>E. crus-galli</i> and at 16 µL/mL for <i>O. sativa f. spontanea</i>. Collectively, these results highlight HFLEO as a potent and eco-friendly natural phytotoxic candidate for the sustainable management of rice weeds, particularly barnyard grass and weedy rice.</p>

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Allelopathic and herbicidal activities of Hedychium forrestii essential oils against major rice weeds

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Ho Le Thi,
  • Phung Dang Linh Bao,
  • Truong Trong Vy,
  • Nguyen The Cuong,
  • Hieu Tran-Trung,
  • Dinh Thi Truong Giang,
  • Hieu Nguyen-Ngoc,
  • Hoang Van Trung,
  • Le Duc Giang

摘要

Chemical herbicides are facing increasing challenges due to the evolution of resistance and environmental concerns, prompting interest in plant-derived allelochemicals for sustainable weed control. This study evaluated the essential oils (EOs) of Hedychium forrestii leaves (HFLEO) and rhizomes (HFREO) as a potential natural phytotoxic agent against barnyard grass (Echinochloa crus-galli) and weedy rice (Oryza sativa f. spontanea), two invasive weed species in rice production. The EOs were hydrodistilled (yields: 0.26% for HFLEO and 0.45% for HFREO), and analyzed chemical composition by GC–MS, and then tested in dose–response bioassays (0–16 µL/mL). The most abundant compound in both EOs was β-pinene (23.78–24.85%), followed by 1,8-cineol and α-pinene. Both EOs inhibited E. crus-galli growth dose-dependently, with HFLEO showing superior efficacy at 4 µL/mL (89.42% shoot, 96.91% root inhibition). Complete growth suppression (100%) occurred at ≥ 8 µL/mL for E. crus-galli and at 16 µL/mL for O. sativa f. spontanea. Collectively, these results highlight HFLEO as a potent and eco-friendly natural phytotoxic candidate for the sustainable management of rice weeds, particularly barnyard grass and weedy rice.