High-density genetic maps, derived from sequencing small fragments and alignment to the V. vinifera PN40024 reference genome, allowed the immediate localization of flanking SNP markers in the physical map without the need for BAC libraries or further sequencing. For Rda1, the smallest supported interval of 300 kb between 19.3 and 19.6 Mbp on chromosome 15, determined in the result with higher LOD (Table 3, LOD 51.4 and 58.6), contains a cluster of NB-LRR genes (Grimplet et al. 2012). As described in other pathosystems, NB-LRR genes are candidates for qualitative resistance to a hemibiotrophic pathogen, such as D. ampelina. For Rda2, the smallest supported interval had less resolution, being located between 1.46 and 2.41 Mbp of chromosome 7 for the result with higher LOD (Table 3, LOD 58.4). This larger region of approximately 950 kb has 134 annotated genes (Grimplet et al. 2012) and no obvious candidate.