College of Plant Protection, Henan Agricultural University, Zhengzhou, China.
Henan Key Laboratory of Creation and Application of New Pesticide, Henan Agricultural University, Zhengzhou, China.
Pest Manag Sci. 2023 Jun;79(6):2126-2134. doi: 10.1002/ps.7386. Epub 2023 Feb 7.
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.
In this study, the DMI fungicide mefentrifluconazole exhibited excellent inhibitory activity against the mycelial growth of S. rolfsii, with a mean EC value of 0.21 ± 0.11 mg L and a range of 0.02 to 0.55 mg L 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 against southern blight still reached 95.36% and 60.94%, respectively, after 9 days of application. No correlation was observed for the sensitivity of S. rolfsii to mefentrifluconazole and the tested DMI, quinone outside inhibitor and succinate dehydrogenase inhibitor fungicides.
All data indicated that mefentrifluconazole could provide favorable control efficacy against S. rolfsii from peanuts and reduce the infection and population of S. rolfsii in the following year. © 2023 Society of Chemical Industry.
致病疫霉（Sclerotium rolfsii）是引起花生南方茎点霉病的病原菌，在中国的发生和危害日益严重，给花生产业造成了严重的经济损失。为了有效防治花生南方茎点霉病，本研究评估了新一代甾醇脱甲基抑制剂（DMI）杀菌剂氟苯醚菌酰胺对花生致病疫霉的生物活性。
本研究表明，DMI 杀菌剂氟苯醚菌酰胺对致病疫霉的菌丝生长具有优异的抑制活性，261 个分离株的平均 EC 值为 0.21 ± 0.11mg/L，范围为 0.02-0.55mg/L。氟苯醚菌酰胺显著降低了菌丝生物量，并影响了菌丝形态。虽然与菌丝生长相比，菌核对氟苯醚菌酰胺更为耐受，但氟苯醚菌酰胺能显著抑制菌核的形成和萌发。此外，由氟苯醚菌酰胺处理的菌丝产生的菌核缺乏营养物质（如蛋白质、碳水化合物和脂质）。这些结果表明，氟苯醚菌酰胺可能会降低次年致病疫霉的种群数量。在温室试验中，氟苯醚菌酰胺对花生南方茎点霉病表现出良好的防治效果和持效性。在施药 9 天后，200mg/L 氟苯醚菌酰胺对南方茎点霉病的预防和治疗活性仍分别达到 95.36%和 60.94%。未发现致病疫霉对氟苯醚菌酰胺的敏感性与测试的 DMI、醌外抑制剂和琥珀酸脱氢酶抑制剂杀菌剂之间存在相关性。
所有数据表明，氟苯醚菌酰胺可对花生致病疫霉提供良好的防治效果，并降低次年致病疫霉的感染和种群数量。© 2023 英国化学学会。
