Trial on leaf removal in the zone of grape bunch of Merlot grapevines in Ticino, Switzerland. Effects on the quality of grapes and wines | Essai de defeuillage de la zone des grappes sur Merlot au Tessin. Effets sur la qualite des raisins et des vins
Murisier, F. | Ferretti, M.(Agroscope RAC Changins, Station federale de recherches agronomiques, Pully (Switzerland). Centre viticole du Caudoz)
Between 1999 and 2003, a trial on leaf removal Merlot grapevines in the zone of grape bunch growth at end of July (beginning of ripening) was conducted on the experimental estate of the Agroscope RAC Changins in Gudo (Ticino), Switzerland. Two variations, with and without defoliation, were compared on two types of training system (single and double _Guyot_ lattice-trained vines). Agronomic, analytical and organoleptic tests were effected. Comparative vinifications were carried out each year of the trial. At identical yields, must sugar content was not influenced by defoliation. The pH, total acidity and malic acid contents of musts tended to be higher (pH) and lower (acidity) in the defoliated variants. Analysis of bottled wines showed that total polyphenols, anthocyans and colour intensity were systematically higher in the wines from defoliated variants. The same wines were also tendencially preferred by wine tasters, with significant differences in 1999, 2002 and 2003.
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