Underlay & underlay vine

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Term for the lower part or rootstock of a grafted vine that originates from a phylloxera-resistant American vine. During grafting, the upper part (scion) of European grape varieties of the species Vitis vinifera is grafted onto this. The main reason for such grafting is the low susceptibility or resistance of the roots of wild American varieties to the underground stages of phylloxera, or to the nodosities and tuberosities (growths) formed on the roots as a result of phylloxera infestation.

Unterteil und Oberteil

Lower part (root system): 1 = grafting point, 2 = lateral roots, 3 = root stem, 4 = foot roots

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