engleski

Effect of early defoliation and grape thinning on grape quality of cv. Moslavac (Vitis vinifera L.)

Cultivar Moslavac is considered as Croatian native cultivar. Because of its thin skin, soft berries and high vigour, the cultivar is susceptible to Botrytis, thus it should be planted on suitable vineyard sites and the canopy management operations should be used to control yield and vine microclimate. The aim of this work is to determine the effect of canopy management operations, early defoliation and grape thinning, on grape quality of cultivar Moslavac. The research was conducted in experimental vineyard in Sveti Urban (region Zagorje- Međimurje) with two treatments, control with none canopy management operations conducted and treatment with conducted early defoliation and grape thinning. Both operations were carried out at the same time, just after flowering. The defoliation was carried out removing all leaves in the fruiting zone, while grape thinning was carried out leaving just one grape bunch per shoot. After vérasion the ripening was monitored by measuring content of sugar and total acidity, while in full ripeness the yield and organic acids were determined. The higher content of sugars was determined at the treatment with early defoliation and grape thinning. Furthermore, the mentioned treatment did not show symptoms of Botrytis. There was no significant difference between treatments considering total acidity and the content of organic acids. It can be concluded that early defoliation and grape thinning had the greatest impact on sugar accumulation and very small impact on total acidity.

Moslavac, early defoliation, grape thinning, quality

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