Iron sulfate applications reduce dollar spot severity on golf course turfgrass, but further optimizing the use of iron sulfate may increase efficacy and encourage more widespread adoption by golf course superintendents. Three iron sulfate rates (9, 18, 36 kg ha−1), two application intervals (7 and 14 days), three water volumes (306, 612, and 1223 L ha−1), and combinations with fertilizer and fungicide products were evaluated at field locations in Madison, WI, Bloomington, MN, and Blacksburg, VA, in 2018 and 2019. Iron sulfate rate decreased dollar spot at all locations in a dose‐dependent manner, and 7‐day applications were more efficacious than 14‐day applications. Water volume had no impact on disease severity at any location and combining iron sulfate with fertilizer had minimal impact as well. These results demonstrate improved iron sulfate strategies for dollar spot management and can be implemented by golf course superintendents in areas where fungicide resistance and fungicide regulations limit the use of traditional fungicides.

中文翻译：

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优化液体施用硫酸铁的用量和施用间隔，以抑制高尔夫球场球道上的美元点


硫酸铁的应用降低了高尔夫球场草坪草的美元斑点严重程度，但进一步优化硫酸铁的使用可能会提高疗效并鼓励高尔夫球场主管更广泛地采用。2018 年和 2019 年，在威斯康星州麦迪逊、明尼苏达州布卢明顿和弗吉尼亚州布莱克斯堡的田间地点评估了三种硫酸铁用量（9、18、36 kg ha-1）、两种施用间隔（7 和 14 天）、三种水量（306、612 和 1223 L ha-1）以及与肥料和杀菌剂产品的组合。硫酸铁用量以剂量依赖性方式在所有位置降低了美元现货，并且 7 天应用比 14 天应用更有效。水量对任何位置的疾病严重程度都没有影响，硫酸铁与肥料的结合也影响最小。这些结果表明，用于美元现货管理的硫酸铁策略得到了改进，并且可以由高尔夫球场主管在杀菌剂耐药性和杀菌剂法规限制使用传统杀菌剂的地区实施。