Cercospora leaf spot (CLS), caused by the fungus, Cercospora beticola, is a major constraint to table beet production in New York (NY). The disease causes defoliation, negatively impacting harvests using top-pulling machinery and rendering plants unsuitable for fresh market sales. High genetic diversity within C. beticola populations can result in the rapid development of resistance to single-site mode of action fungicides. Therefore, products with multiple modes of action and/or differential site-specific modes of action are highly desirable to improve the resiliency of CLS management. In 2021 and 2022, small plot replicated trials were conducted to evaluate the efficacy of selected fungicides for CLS management in table beet at Geneva, NY. Propiconazole, pydiflumetofen + fludioxonil, and copper hydroxide were the most efficacious for CLS management and not significantly different between each other. Across these treatments, CLS severity was reduced by 72.8% and 78.6% compared to nontreated plots in 2021 and 2022, respectively. Trifloxystrobin + fluopyram, pyrimethanil + fluopyram and pyraclostrobin + fluxapyroxad provided moderate disease control with an average reduction of 45.4% and 56.7% in CLS severity in 2021 and 2022, respectively. Trifloxystrobin and a proprietary copper + zinc (Cu/Zn) compound at two rates (0.25% and 0.5% v/v) also significantly reduced CLS severity by 20.1% in 2021 but not in 2022. Improvements in foliar health through reduced CLS severity had no significant effect on root shape, size, color, and sugar content. This information underpins best management practices for foliar health leading to economic and sustainable outcomes for table beet producers.

中文翻译：

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纽约州甜菜叶面杀菌剂对尾孢菌叶斑病管理的评价


由真菌 Cercospora beticola 引起的尾孢菌叶斑病 （CLS） 是纽约 （NY） 食用甜菜生产的主要制约因素。这种疾病会导致落叶，对使用顶部拉拔机械的收成产生负面影响，并使植物不适合新鲜市场销售。C. beticola 种群中的高度遗传多样性会导致对单点作用方式杀菌剂的抗性迅速发展。因此，非常需要具有多种作用模式和/或不同部位特异性作用模式的产品来提高 CLS 管理的弹性。在 2021 年和 2022 年，在纽约州日内瓦进行了小块重复试验，以评估选定的杀菌剂对甜菜 CLS 管理的疗效。丙环唑、吡啶氟氧芬 + 咯菌腈和氢氧化铜对 CLS 管理最有效，彼此之间无显著差异。在这些治疗中，与 2021 年和 2022 年未治疗的地块相比，CLS 严重程度分别降低了 72.8% 和 78.6%。Trifloxystrobin + fluopyram、pyrimethanil + fluopyram 和 pyraclostrobin + fluxapyroxad 提供了中度疾病控制，2021 年和 2022 年CLS 严重程度平均降低 45.4% 和 56.7%。Trifloxystrobin 和一种专有的铜 + 锌 （Cu/Zn） 化合物以两种速率 （0.25% 和 0.5% v/v） 在 2021 年也显著降低了 20.1%，但在 2022 年没有。通过降低 CLS 严重程度来改善叶面健康，对根的形状、大小、颜色和糖含量没有显着影响。这些信息为叶面健康的最佳管理实践奠定了基础，从而为甜菜生产商带来经济和可持续的结果。