Dollar spot (caused by Clarireedia jacksonii) receives more fungicide applications than any other turfgrass disease. Increasing restrictions on fungicide usage and expanding reports of fungicide resistant fungal populations have resulted in renewed interest in biological and plant-based control of turfgrass diseases. Six commercially available biological fungicides (Actinovate AG, Double Nickel LC, Nortica, Rhapsody, Serende Opti, Zio) and two oil-based fungicides (Civitas, Timorex Gold) were evaluated for dollar spot control on a creeping bentgrass putting green in Madison, WI, USA in 2017 and 2018. No biological or oil-based fungicide provided effective full-season dollar spot control compared to the synthetic fungicide boscalid. However, Civitas mineral oil provided levels of dollar spot control similar to boscalid on 9 of 12 rating dates over both years. The remaining treatments tested provided levels of dollar spot control and turf quality similar to boscalid ranging from 4 to 7 of a possible 12 rating dates. These results indicate that the biological fungicides tested here failed to provide commercially acceptable dollar spot control under moderate disease pressure in the midwestern U.S. The mineral oil Civitas did provide effective suppression under moderate disease pressure, while the tea tree oil Timorex Golf did not. Certain oil-based fungicides like Civitas can provide effective dollar spot control during periods of low to moderate disease pressure, but more research is needed before biological fungicides can be successfully integrated into a dollar spot management program.

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评估生物和油基杀菌剂在草坪上抑制美元斑点

美元现货（由Clarireedia jacksonii引起）) 比任何其他草坪病害获得更多的杀菌剂应用。对杀真菌剂使用的限制越来越多，对杀真菌剂抗性真菌种群的报道越来越多，这导致人们对草坪病的生物和植物防治重新产生兴趣。在威斯康星州麦迪逊市的匍匐翦股颖果岭上评估了六种市售生物杀菌剂（Actinovate AG、Double Nickel LC、Nortica、Rhapsody、Serende Opti、Zio）和两种油基杀菌剂（Civitas、Timorex Gold）的美元斑点控制，美国在 2017 年和 2018 年。与合成杀菌剂啶酰菌胺相比，没有生物或油基杀菌剂提供有效的全季节美元斑点控制。然而，Civitas 矿物油在两年内的 12 个评级日期中有 9 个提供了类似于啶酰菌胺的美元现货控制水平。其余测试的处理提供了与啶酰菌胺相似的美元斑点控制水平和草皮质量，范围从可能的 12 个评级日期中的 4 个到 7 个。这些结果表明，在美国中西部，在中等病害压力下，这里测试的生物杀菌剂未能提供商业上可接受的美元斑点控制。矿物油 Civitas 在中等病害压力下确实提供了有效抑制，而茶树油 Timorex Golf 则没有。某些油基杀菌剂（如 Civitas）可以在低至中度病害压力期间提供有效的美元现货控制，但在生物杀菌剂成功整合到美元现货管理计划之前，还需要进行更多的研究。