ISHS Acta Horticulturae 617: Workshop on Rootstocks' Performance in Phylloxera Infested Vineyards
PERFORMANCE OF VITIS CINEREA HYBRIDS IN MOTHERBLOCK AND NURSERY - PRELIMINARY RESULTS |
| Authors: | J. Schmid, H. Rühl |
| Keywords: | rootstock, grapevine, breeding, resistance, tolerance, Vitis cinerea |
| Abstract:
Rootstocks, currently used in most grape growing areas of the world, are not resistant, but tolerant to phylloxera, allowing the insect to feed both on its roots and on its leaves. Complete resistance has been reported from Muscadinia rotundifolia and Vitis cinerea. As M. rotundifolia is difficult to use in breeding, due to a dissimilar number of chromosomes, in Germany V. cinerea has been used since the late 1930s to aim for completely resistant rootstock varieties. This resulted in the variety ‘Börner’, registered in 1989. Based on this experience, in 1992 the Department of Grapevine Breeding at Geisenheim initiated a new rootstock breeding program for rootstocks with complete phylloxera resistance, good rooting and grafting ability and a good performance even on difficult sites, e.g. dry or calcareous soils. These hybrids were assessed for, susceptibility to lime induced iron chlorosis, wood production, rooting and grafting ability in motherblock trials. Results indicate a large variation within the hybrid populations, with some hybrids showing interesting characters. The first of these superior hybrids have been grafted and are currently assessed for their viticultural performance. | |
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