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<p>Fluazinam is a primary agent for controlling clubroot in oilseed rape (<i>Brassica napus</i> L.). Although its microcapsule formulation shows considerable potential for improving efficacy and reducing application rates, its development and practical application have not been scientifically validated. This study developed a fluazinam polyurea microcapsule suspension seed‑coating agent (FPMS). The resulting microcapsules exhibited uniform particle size (0.516 ± 0.172&#xa0;μm), high encapsulation efficiency (81.94%), and sustained release lasting over 60 days in field soil. In vitro bioassays demonstrated that FPMS provided significantly higher efficacy against clubroot in oilseed rape than conventional free fluazinam suspension across all tested ratios, with a peak efficacy of 71.83%. Field trials further confirmed its superior performance, achieving control efficacies of 75.3% in high‑risk fields (&gt; 10⁵ spores/g soil; PGRO standard) and 58.24% in extreme‑risk fields (&gt; 10⁹ spores/g soil). Compared to soil treatment, FPMS seed coating reduced the fluazinam application rate per unit area and maintained effective release beyond 60 days. Moreover, FPMS enhanced seed vigor and yield‑related traits by alleviating phytotoxicity. These results demonstrate that FPMS offers an efficient and sustainable strategy for managing clubroot in oilseed rape.</p>

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Development and evaluation of fluazinam-loaded polyurea microcapsules for enhanced control of clubroot disease in Brassica napus

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Zhou Xufan,
  • Cai Lei,
  • Duan Xianpeng,
  • Zhou Qianhui,
  • Long Haohao,
  • Yu Kunjiang

摘要

Fluazinam is a primary agent for controlling clubroot in oilseed rape (Brassica napus L.). Although its microcapsule formulation shows considerable potential for improving efficacy and reducing application rates, its development and practical application have not been scientifically validated. This study developed a fluazinam polyurea microcapsule suspension seed‑coating agent (FPMS). The resulting microcapsules exhibited uniform particle size (0.516 ± 0.172 μm), high encapsulation efficiency (81.94%), and sustained release lasting over 60 days in field soil. In vitro bioassays demonstrated that FPMS provided significantly higher efficacy against clubroot in oilseed rape than conventional free fluazinam suspension across all tested ratios, with a peak efficacy of 71.83%. Field trials further confirmed its superior performance, achieving control efficacies of 75.3% in high‑risk fields (> 10⁵ spores/g soil; PGRO standard) and 58.24% in extreme‑risk fields (> 10⁹ spores/g soil). Compared to soil treatment, FPMS seed coating reduced the fluazinam application rate per unit area and maintained effective release beyond 60 days. Moreover, FPMS enhanced seed vigor and yield‑related traits by alleviating phytotoxicity. These results demonstrate that FPMS offers an efficient and sustainable strategy for managing clubroot in oilseed rape.