Bioactivity of the DMI fungicide mefentrifluconazole against Sclerotium rolfsii , the causal agent of peanut southern blight

作者：Zhiyuan Han, Kaidi Cui, Mengke Wang, Chaofan Jiang, Te Zhao, Meizi Wang, Pengqiang Du, Leiming He, Lin Zhou · 发表于：Pest Management Science · 年份：2023 · DOI：10.1002/ps.7386 · 被引用次数：39 · 研究领域：Peanut Plant Research Studies、Fungal Plant Pathogen Control、Plant Disease Resistance and Genetics

Abstract Background Sclerotium rolfsii , the causal agent of peanut southern blight, has become increasingly prevalent and harmful in China, causing serious economic losses to the peanut industry. To effectively manage peanut southern blight, this study evaluated the bioactivity of the new‐generation sterol demethylation inhibitor (DMI) fungicide mefentrifluconazole against peanut S. rolfsii . Results In this study, the DMI fungicide mefentrifluconazole exhibited excellent inhibitory activity against the mycelial growth of S. rolfsii , with a mean EC 50 value of 0.21 ± 0.11 mg L −1 and a range of 0.02 to 0.55 mg L −1 for 261 isolates collected from Hebei, Henan and Shandong provinces. Mefentrifluconazole significantly reduced the biomass of mycelia and affected the morphology of hyphae. Although sclerotia were more tolerant to mefentrifluconazole than mycelial growth, mefentrifluconazole greatly inhibited the formation and germination of sclerotia. In addition, sclerotia produced by mefentrifluconazole‐treated mycelia were deficient in nutrients (e.g., protein, carbohydrate and lipid). These results indicated that mefentrifluconazole may reduce the population of S. rolfsii in the following year. In greenhouse experiments, mefentrifluconazole showed control efficacy and good persistence against peanut S. rolfsii . The preventative and curative activities of mefentrifluconazole at 200 mg L −1 against southern blight still reached 95.36% and 60.94%, respectively, after 9 days of...