Abstract Management practices, such as leaf removal, can affect grape cluster architecture and the microclimate around the cluster, which influences the development of Botrytis bunch rot disease. The timing of leaf removal among five different phenological stages was investigated as a tool for managing grape cluster architecture-related variables and for managing Botrytis bunch rot of Sauvignon Blanc grapevines. A commercial vineyard located in Sao Joaquim municipality, in the highland region of Santa Catarina State, Southern Brazil, was assessed in a randomized complete block design during the 2015 and 2016 growing seasons. The treatments consisted of leaf removal of four basal leaves around clusters at the phenological stages of full bloom, buckshot berries, pea-sized berries, veraison, and 15 days after veraison. At harvest, cluster architecture variables (cluster length, cluster mass, rachis mass, number of berries, berry mass, and cluster compactness index) and Botrytis bunch rot incidence and severity were assessed weekly from the first appearance of symptoms to harvest. Disease progress curves were constructed and compared to several epidemiological parameters. There was no significant effect of the removal of four basal leaves on the cluster architecture-related variables (cluster and berry masses, number of berries, and cluster compactness index); however, reduced the intensity of Botrytis bunch rot. Leaf removal carried out before veraison significantly reduced (P

中文翻译：

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去叶对巴西南部长相思葡萄葡萄簇结构和灰葡萄孢菌群腐病防治的影响

摘要 摘叶等管理措施会影响葡萄簇结构和簇周围的小气候，从而影响灰葡萄孢菌丛腐病的发展。研究了五个不同物候阶段的叶片去除时间，作为管理葡萄簇结构相关变量和管理长相思葡萄藤葡萄藤腐烂的工具。位于巴西南部圣卡塔琳娜州高地地区圣若阿金市的一个商业葡萄园在 2015 年和 2016 年的生长季节以随机完整区块设计进行了评估。处理包括在盛开、雄鹿浆果、豌豆大小的浆果、转色和转色后 15 天的物候阶段去除簇周围的四片基生叶。收获时，从症状首次出现到收获，每周评估簇结构变量（簇长度、簇质量、轴质量、浆果数量、浆果质量和簇紧密度指数）和葡萄孢霉腐烂发生率和严重程度。构建疾病进展曲线并与几个流行病学参数进行比较。去除四片基叶对簇结构相关变量（簇和浆果质量、浆果数量和簇紧密度指数）没有显着影响；然而，降低了灰霉病菌丛腐病的强度。在 veraison 之前进行的叶子去除显着减少（P 从第一次出现症状到收获，每周评估葡萄孢属菌丛腐烂发生率和严重程度。构建疾病进展曲线并与几个流行病学参数进行比较。去除四片基叶对簇结构相关变量（簇和浆果质量、浆果数量和簇紧密度指数）没有显着影响；然而，降低了灰霉病菌丛腐病的强度。在 veraison 之前进行的叶子去除显着减少（P 从第一次出现症状到收获，每周评估葡萄孢属菌丛腐烂发生率和严重程度。构建疾病进展曲线并与几个流行病学参数进行比较。去除四片基叶对簇结构相关变量（簇和浆果质量、浆果数量和簇紧密度指数）没有显着影响；然而，降低了灰霉病菌丛腐病的强度。在 veraison 之前进行的叶子去除显着减少（P 和集群紧凑性指数）；然而，降低了灰霉病菌丛腐病的强度。在 veraison 之前进行的叶子去除显着减少（P 和集群紧凑性指数）；然而，降低了灰霉病菌丛腐病的强度。在 veraison 之前进行的叶子去除显着减少（P