Saint-Côme B
Name of vine variety in France
Saint-Côme
Origin
This vine variety is native to the Aveyron region is, based on published genetic analyses, is probably a descendant of Gouais B.
Synonymy
Regulations
In France, Saint-Côme B is officially listed in the "Catalogue of vine varieties".
Use
Wine vine variety
Evolution of area under vines in France
2016
ha 3.3
Description
Identification signs include:
- the tip of the young shoot has a heavy coat of flat-lying hairs,
- the young leaves are yellow with bronze patches,
- the shoots have heavy anthocyanin coloration,
- orbicular adult leaves with 5 lobes and deep rounded lateral sinuses, a slightly open V-shaped petiolar sinus or with slightly overlapping lobes; moderate size teeth compared to width at base, straight or convex sides, moderate anthocyanin coloration of veins; a roughly bubbled leaf blade, slightly revolute and cupped and the underside with a moderate coat of upright and flat-lying hairs on the leaf blade and a heavy coat of upright hairs on the veins, 
- round-shaped berries with significant bloom.
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 131 236 247 172 204 238 238 227 239
Allel 2 137 238 249 176 204 248 238 243 249
Phenology
Bud burst: 1 day before Chasselas. Grape maturity: period I, 1 week after Chasselas.
Suitability for cultivation and agronomic production
Saint-Côme B is not very fertile and would appear to be adapted to long pruning.
Sensitivity to diseases and pests
Due to the compact nature of the grape clusters, Saint-Côme B is somewhat susceptible to grey rot. It would appear not be particularly susceptible to other fungus diseases.
Technological potential
Grape clusters are small to moderate and the berries are moderate size. The sugar potential of Saint-Côme B is good and this vine variety can produce white wines with high acidity levels.
Clonal selection in France
There are no approved clones for this variety at the present time. A conservatory with a dozen clones was set up in 2004 in the Aveyron region.
Bibliographic references
- Catalogue des variétés et clones de vigne cultivés en France. Collectif, 2007, Ed. IFV, Le Grau-du-Roi.
- Documentation interne du Domaine de Vassal. 1949-2011, INRA, Marseillan-plage.