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ungrafted

Term (also direct bearer, self bearer, rootstock) for a vine if the lower (rootstock) and upper part (scion) originate from the same plant. This means that no grafting has taken place. Worldwide, 90% of the vines used are grafted vines, because only these are guaranteed to be resistant to phylloxera.

Veredelung - Unterteil und Oberteil

The diagram shows the lower part (the root system) and the upper part (the scion) of a grafted vine.

Prerequisites

A special type of soil or high-altitude vineyards, such as in the Italian Aosta Valley in the Blanc de Morgex et de La Salle area, are prerequisites for the cultivation of ungrafted vines. Sand or sandstone (made up of tiny particles of weathered rock) is one of the few soils in which phylloxera does not thrive. The soil drains well, but does not have a good water retention capacity. The grape variety grown and its resistance to phylloxera is also a criterion. There are also special new varieties in which this characteristic (ex species Vitis cinerea) is crossed, but this almost exclusively concerns rootstocks for the purpose of grafting.

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Dr. Christa Hanten

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Dr. Christa Hanten
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