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<p>New alternatives to protect plants against fungal pathogens are needed to prevent yield losses. It is established that UV-C has a disinfecting effect against a variety of microorganisms, including fungi. Furthermore, UV-C radiation can stimulate plants’ defense. <i>Blumeria graminis</i> f. sp. <i>hordei</i>, the causal agent of powdery mildew in barley, is at high risk of developing resistance to fungicides and overcoming host resistance. This study investigated the effects of UV-C treatment before and after inoculation with <i>B. graminis</i> to ascertain the effects of stimulating plant’s defense and the effects of UV-C treatment direct on <i>B. graminis</i>. The efficacy of low pressure mercury vapor lamps (Hg) with a peak of 254&#xa0;nm and LED lamps with a peak between 263 and 275&#xa0;nm was evaluated under variable application times and dosages. Results indicated no significant visible effects when plants were irradiated before inoculation. However, the direct treatment of spores showed reduced germination in vitro. Furthermore, the treatment of leaves after inoculation demonstrated a reduction in pustule numbers of up to 98% (at a dose of 0.45 kJ/m<sup>2</sup>), as well as a decrease in pustule size. Efficacy was enhanced with increasing dosages. The efficacy of the treatment is contingent upon the dosage, timing of application, and source of UV-C radiation. The LED UV-C treatment was more effective than the Hg UV-C treatment. The results of this study indicate that UV-C treatment could be an alternative crop protection measure against <i>B. graminis</i>.</p>

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Advancing barley protection: a study of UV-C light sources against powdery mildew (Blumeria graminis f. sp. hordei)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月15日

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  • Aileen Hahlbohm,
  • Christine Struck,
  • Friederike de Mol,
  • Eike Stefan Dobers,
  • Becke Strehlow

摘要

New alternatives to protect plants against fungal pathogens are needed to prevent yield losses. It is established that UV-C has a disinfecting effect against a variety of microorganisms, including fungi. Furthermore, UV-C radiation can stimulate plants’ defense. Blumeria graminis f. sp. hordei, the causal agent of powdery mildew in barley, is at high risk of developing resistance to fungicides and overcoming host resistance. This study investigated the effects of UV-C treatment before and after inoculation with B. graminis to ascertain the effects of stimulating plant’s defense and the effects of UV-C treatment direct on B. graminis. The efficacy of low pressure mercury vapor lamps (Hg) with a peak of 254 nm and LED lamps with a peak between 263 and 275 nm was evaluated under variable application times and dosages. Results indicated no significant visible effects when plants were irradiated before inoculation. However, the direct treatment of spores showed reduced germination in vitro. Furthermore, the treatment of leaves after inoculation demonstrated a reduction in pustule numbers of up to 98% (at a dose of 0.45 kJ/m2), as well as a decrease in pustule size. Efficacy was enhanced with increasing dosages. The efficacy of the treatment is contingent upon the dosage, timing of application, and source of UV-C radiation. The LED UV-C treatment was more effective than the Hg UV-C treatment. The results of this study indicate that UV-C treatment could be an alternative crop protection measure against B. graminis.