• » News
  • » The Salvibio project at Conavi 2022 with a study on the minor grape variety Santa Maria

The Salvibio project at Conavi 2022 with a study on the minor grape variety Santa Maria

Effects of pre-flowering defoliation on the composition and dehydration dynamics of grapes intended for wine production

From 13th to 15th May 2022, the IX National Viticulture Conference (CONAVI) was held at the former monastery of San Francesco in Conegliano Veneto (TV), organised by the viticulture working group within the Società di Ortoflorofrutticoltura Italiana (SOI). As part of the congress, Tommaso Frioni presented a report on the use of the early defoliation technique to improve the suitability for drying of Santa Maria grapes, an autochthonous Piacenza variety used to produce Vin Santo di Vigoleno. The activity, carried out within the framework of action 5 of the plan, at the Azienda Agricola Lusignani di Vigoleno (Vernasca, PC), aims to develop an innovative protocol for managing the vineyard and the drying phase, according to the specific characteristics of the minor varieties used in the area. Santa Maria and Melara can in fact present compact bunches and thin-skinned grapes, which are often subject to rot both in the field and later in the drying rooms. In particular, the trial showed that a defoliation of the 6 basal leaves carried out pre-flowering (Fig.1) reduced fruit set from 42 to 33%. This in turn reduced bunch firmness, which was less susceptible to rot. The reduction in fruit set and in the number of berries per cluster did not lead to a reduction in yield since, due to a compensating effect, the berries in the defoliated plants were larger (Table 1). At harvest, the grapes from the plants subjected to early defoliation had more sugars than the control, and an unchanged titratable acidity. During the drying process, they showed a higher daily dehydration rate due to their larger size and reduced firmness, which favoured transpiration in the first 20 days after harvest (Chart 1). At 60 days, the grapes from the defoliated thesis had more sugar and more titratable acidity (Graph 2). The spread of rot was minimal in both theses, as the season was very dry and the grapes were in excellent condition at harvest The work will continue in 2022, in order to validate the preliminary results of 2021, and with the aim of evaluating in more detail any different susceptibility to rot.


Fig. 1 Santa Maria vines subjected to pre-flowering defoliation


Fig. 2 Santa Maria bunches of plants subject to early defoliation (left) and control plants (right)

Table 1 Yield and production components


Diagram 1 Development of berry water loss during the drying phases


Diagram 2 Evolution of sugars (left) and titratable acidity (right) during the drying phase

Published on 06/17/2022
Item available in italiano
Related sheets
    Pectinases and their applications in wine
    We are all familiar with pectins, those polysaccharides that give turgidity, firmness and compactness to plant tissues and walls, which protect the plant from external aggressions such as drought o...
    Published on:11/23/2022
    IVAS 2022 repository is now available
    A repository of 71 videos is available for purchase for two months only.
    IVAS 2022 provides a unique international platform for interchange between researchers dedicated to the different aspects of the chemistry of grape, wine and spirits production including topics suc...
    Published on:11/18/2022
    Respecting and enhancing wine identity
    Auroras®: the vision of VASONGROUP
    The union of two different and distant entities, which together generate something wonderful. The products of JUCLAS and Enologica Vason united to enhance the identity of wines
    Published on:11/09/2022
    Enzymatic analysis 4.0 + CIELab color analysis
    Come and try Smart Analysis at SIMEI in Milan
    DNAPhone invites you to SIMEI, the International Oenology and Bottling Machine Exhibition to be held in Milan from 15 to 18 November, to learn about and try Smart Analysis, the made in Italy platfo...
    Published on:11/07/2022
    Fourteen Years that Have Changed Wine Trade
    The WBWE will hold its 14th edition, becoming the crucial trade fair for the wine industry. The entire sector will be reunited in Amsterdam on the 21st and 22nd of November 2022
    Published on:11/07/2022
    From Bordeaux to Milan, a shower of awards for Parsec
    The multi-award-winning company in the Vinitech Sifel Innovation Trophy and the Simei 2022 Lucio Mastroberardino Innovation Challenge
    The roads to sustainability and quality necessarily pass through process control, traceability, optimised use of data and reduced time and consumption. These are the outstanding features of Quadr@ ...
    Published on:11/01/2022
© All Right Reserved
ISSN 1826-1590 VAT: IT01286830334
powered by Infonet Srl Piacenza
- A +
ExecTime : 2,390625