Description of cultivars using microsatellites 3. For fungus resistance breeding, the knowledge of the grapevine cultivar s degree of resistance to the main fungus diseases is a precondition concerning the choice of parents. The participants agreed on the preliminary version of the OIV descriptor definition to assess the degree of resistance to Plasmopara viticola, Uncinula necator and Botrytis.
Improvements are underway.
Microsatellites are an efficiant tool for grapevine cultivar differentiation and identification. Therefore a new experiment was designed having as objective the coding of the size of the alleles with known cultivars, which would be used as standards. The participants agreed on 14 primary descriptors as priority one. The chosen descriptors show a good discriminating power between cultivars. Most of them are easy to score.