Journal article

The Influence of Apical and Basal Defoliation on the Canopy Structure and Biochemical Composition of Vitis vinifera cv. Shiraz Grapes and Wine

Pangzhen Zhang, Xiwen Wu, Sonja Needs, Di Liu, Sigfredo Fuentes, Kate Howell



Defoliation is a commonly used viticultural technique to balance the ratio between grapevine vegetation and fruit. Defoliation is conducted around the fruit zone to reduce the leaf photosynthetic area, and to increase sunlight exposure of grape bunches. Apical leaf removal is not commonly practiced, and therefore its influence on canopy structure and resultant wine aroma is not well-studied. This study quantified the influences of apical and basal defoliation on canopy structure parameters using canopy cover photography and computer vision algorithms. The influence of canopy structure changes on the chemical compositions of grapes and wines was investigated over two vintages (2010-2011 and 2..

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Funding Acknowledgements

This work was sponsored by the Rathbone Wine Group and The University of Melbourne. The work was performed at the University of Melbourne and Yering Station Winery. Funding was received from the Faculty of Veterinary and Agricultural Sciences, University of Melbourne. The authors thank Mr. Andy Clark, Mr. Willy Lunn, and the late Mr. Nathan Scarlett (Rathbone Wine Group) for their support and assistance with the field trials.