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<p>White rust caused by <i>Puccinia horiana</i> is a devastating disease affecting chrysanthemum production in Japan. In the 2010s, an outbreak caused extensive economic damage to production. Fungicide application is the most widely used strategy to control white rust; however, chemical control has become difficult owing to the development of fungicide resistance in <i>P. horiana</i>. This study aimed to evaluate the efficacy of fungicides, optimal application methods, and in vitro sensitivity. Efficacy trials revealed that pyraclostrobin and inpyrfluxam were the most effective among the tested 17 fungicides with control efficacies of &gt; 90. Myclobutanil and hexaconazole were the second-most effective fungicides. In contrast, the four multi-site inhibitors moderately suppressed disease incidence. Successive application of pyraclostrobin and inpyrfluxam at 2-week intervals was highly effective against <i>P. horiana</i>, with a control efficacy of &gt; 90. Myclobutanil and hexaconazole showed slightly lower efficacy than pyraclostrobin and inpyrfluxam. The disease incidence in cuttings was effectively controlled by inpyrfluxam, hexaconazole, myclobutanil, and pyraclostrobin application to diseased mother plants before cutting harvest. In the minimum inhibitory concentration (MIC) evaluation, the sensitivity to inpyrfluxam and pyraclostrobin was higher than to penthiopyrad and azoxystrobin within the same chemical class, consistent with the results of the field efficacy trials. However, the sensitivity to demethylation inhibitor (DMI) fungicides was not consistent with the efficacy in field trials; triforine showed ten times higher sensitivity than myclobutanil and hexaconazole. Our results contribute to the selective use of effective fungicides and the establishment of efficient and effective application conditions for the control of white rust.</p>

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Efficacy of fungicides and application condition for stable control of chrysanthemum white rust caused by Puccinia horiana

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Shunsuke Asano,
  • Kotaro Hori,
  • Yoshihiko Hirayama

摘要

White rust caused by Puccinia horiana is a devastating disease affecting chrysanthemum production in Japan. In the 2010s, an outbreak caused extensive economic damage to production. Fungicide application is the most widely used strategy to control white rust; however, chemical control has become difficult owing to the development of fungicide resistance in P. horiana. This study aimed to evaluate the efficacy of fungicides, optimal application methods, and in vitro sensitivity. Efficacy trials revealed that pyraclostrobin and inpyrfluxam were the most effective among the tested 17 fungicides with control efficacies of > 90. Myclobutanil and hexaconazole were the second-most effective fungicides. In contrast, the four multi-site inhibitors moderately suppressed disease incidence. Successive application of pyraclostrobin and inpyrfluxam at 2-week intervals was highly effective against P. horiana, with a control efficacy of > 90. Myclobutanil and hexaconazole showed slightly lower efficacy than pyraclostrobin and inpyrfluxam. The disease incidence in cuttings was effectively controlled by inpyrfluxam, hexaconazole, myclobutanil, and pyraclostrobin application to diseased mother plants before cutting harvest. In the minimum inhibitory concentration (MIC) evaluation, the sensitivity to inpyrfluxam and pyraclostrobin was higher than to penthiopyrad and azoxystrobin within the same chemical class, consistent with the results of the field efficacy trials. However, the sensitivity to demethylation inhibitor (DMI) fungicides was not consistent with the efficacy in field trials; triforine showed ten times higher sensitivity than myclobutanil and hexaconazole. Our results contribute to the selective use of effective fungicides and the establishment of efficient and effective application conditions for the control of white rust.