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Impact of late winter pruning of Portugieser grapevines (Vitis vinifera L.) on yield components and grape composition

Postponing pruning until early spring has been shown to be an effective way of delaying vine phenology. We investigated the effects of the timing of late winter pruning on ‘Portugieser’ vines in northwestern Croatia (2021), on yield, berry primary and phenolic composition. Late winter pruning (at the time of budbreak of basal buds and when two to three leaves were separated) was compared with standard winter pruning. Late winter pruning at budbreak resulted in grapes with the highest total phenolic and anthocyanin content and the lowest sugar and flavonol content at harvest, while late winter pruning performed when two to three leaves were separated had the highest titratable acidity and lowest total phenolic content.

grapevine, anthocyanins, late pruning, polyphenols

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