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Newly bred varieties of phylloxera tolerant rootstocks

Becker, Andreas, Schartl, Angelika, Herrmann, Josef V.
Acta horticulturae 2003 no.603 pp. 745-748
Vitis cinerea, Vitis riparia, Vitis vinifera, crossing, cultivars, genotype, microclimate, nutrient uptake, planting, root rot, roots, rootstocks, scions, soil water, stress tolerance, water stress, Italy
For testing phylloxera tolerance 179 descendants from crosses performed in Würzburg since 1962 were planted in a region with high phylloxera pressure near Caprino Veronese, North Italy, in 1988. After 12 years of selection and scrutiny of young roots for nodosities, and old roots for tuberosities and root rot 24 phylloxera tolerant cultivars have been selected. To meet the range of various viticultural requirements different varieties were crossed with wild species. In the often highly branched family trees of 18 newly bred rootstocks Vitis riparia is dominating. Two genotypes derive from Vitis cinerea, Sorisil and Vitis vinifera, respectively. After selection in Northern Italy the rootstocks are now under scrutiny in Franconia on a calcareous skeleton soil for water stress tolerance, for disposition to chlorosis and to couluring, and nutrient uptake. At a later date tests for grafting ability, affinity to different scions and adaptation to various soils and microclimates will follow.