Canopy management techniques can be beneficial to grapevine reproduction because they improve canopy structure and microclimate. In this study, the influence of different canopy management practices—cluster thinning, leaf removal, shoot-thinning, and light pruning—on reproductive performance was studied for the varieties Semillon and Shiraz grown under field conditions in a hot climate in South Australia. Canopy architecture, canopy light interception, and reproductive parameters for different management practices were measured. Results showed that the applied practices modified canopy architecture and influenced reproductive performance and the berry ripening process. Specifically, shoot-thinning and leaf removal decreased leaf area index and increased canopy porosity and light interception. Berry ripening was positively affected by cluster thinning and shoot-thinning, while leaf removal and light pruning delayed the process. For reproductive parameters, leaf removal had a relatively minor effect; shoot-thinning and cluster thinning reduced cluster number but showed compensation effects in other yield components, and light pruning decreased berry weight. In addition, cluster compactness was found to be significantly correlated with bunch rot (Botrytis cinerea) incidence for Semillon.

中文翻译：

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冠层管理实践对炎热气候下赛美蓉和设拉子葡萄冠层结构和繁殖性能的影响

冠层管理技术有利于葡萄树的繁殖，因为它们可以改善冠层结构和微气候。在这项研究中，研究了在南澳大利亚炎热气候下在田间条件下种植的赛美蓉和设拉子品种的不同冠层管理实践——疏林、去除叶子、疏枝和轻修剪——对繁殖性能的影响。测量了不同管理实践的冠层结构、冠层光拦截和繁殖参数。结果表明，应用实践改变了冠层结构并影响了繁殖性能和浆果成熟过程。具体而言，疏枝和叶片去除降低了叶面积指数并增加了冠层孔隙度和光拦截。浆果成熟受到簇疏和疏芽的积极影响，而去叶和轻度修剪延迟了这一过程。对于繁殖参数，去除叶子的影响相对较小；疏枝和疏枝减少了簇数，但对其他产量成分显示出补偿效应，轻修剪降低了浆果的重量。此外，发现簇的紧密度与赛美蓉的簇腐病（灰葡萄孢）发生率显着相关。