Abstract In recent years, succinate dehydrogenase inhibiting (SDHI) fungicides have become important for control of early leaf spot (Passalora arachidicola) and late leaf spot (Nothopassalora personata) of peanut (Arachis hypogaea) in the southeastern U.S. In this study, pyraclostrobin, cyproconazole, and thiophanate-methyl were compared for efficacy alone and as mixing partners with SDHI fungicide penthiopyrad for control of late leaf spot. In all trials, mixtures of penthiopyrad + pyraclostrobin or penthiopyrad + cyproconazole improved leaf spot control compared to penthiopyrad alone based final percent defoliation, and in most cases based on area under the defoliation progress curve. Additional control provided by mixtures with thiophanate-methyl was minimal compared to penthiopyrad alone. In trials at Tifton and Plains, GA, efficacies of the mixtures of penthiopyrad + cyproconazole and penthiopyrad + pyraclostrobin were greater than expected based on performance of the respective individual fungicides, indicating synergistic effects of these fungicide combinations.

中文翻译：

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DMI和QoI杀菌剂与SDHI杀菌剂吡噻菌胺对花生晚叶斑病的影响

摘要 近年来，琥珀酸脱氢酶抑制 (SDHI) 杀菌剂在美国东南部花生 (Arachis hypogaea) 早期叶斑病 (Passalora arachidicola) 和晚期叶斑病 (Nothopassalora personata) 的防治中发挥重要作用。和甲基硫菌灵单独和作为与 SDHI 杀真菌剂戊噻菌灵混合使用以控制晚叶斑病的功效进行了比较。在所有试验中，与单独使用吡噻菌胺相比，吡噻菌胺 + 唑菌胺酯或吡菌胺 + 环丙康唑的混合物改善了叶斑控制，基于最终落叶百分比，并且在大多数情况下基于落叶进程曲线下的面积。与单独的吡噻菌胺相比，由甲基噻菌灵的混合物提供的额外控制是最小的。在佐治亚州蒂夫顿和普莱恩斯的试验中，