Courbu B
Name of vine variety in France
Courbu
Origin
Courbu B is a native vine variety from the Pyrenees vineyards. This variety does not correspond to the white form of Courbu noir N. It is a distinct vine variety.
Synonymy
In France, this variety can officially be called "Gros Courbu B" for plant propagation material. In Spain, Courbu B can officially be called "Hondarrabi Zuri".
Regulations
This vine variety is likewise listed in the Catalogue of Spain.
Use
Wine vine variety
Evolution of area under vines in France
1958 1968 1988 2000 2008 2016
ha 295 142 86 48 44 29
Description
Identification signs include:
- the young leaves are red and very bronze,
- adult leaves are large, 3 or 5 lobes with a closed petiolar sinus and overlapping lobes, shallow lateral sinuses, short teeth compared to width at base, straight or convex sides, very bubbled leaf blade, jagged or revolute, wavy near the petiolar point and the underside with a slight coat of flat-lying anf upright hairs,
- the berries are flat or round-shaped, greenish yellow in color or slightly pink when ripe.
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 131 223 243 182 188 252 248 233 239
Allel 2 149 236 247 188 204 252 248 235 271
Phenology
Bud burst: 7 days after Chasselas. Grape maturity: period II, 3 and 1/2 to 4 weeks after Chasselas.
Suitability for cultivation and agronomic production
This vine variety is wind sensitive. Preference is given to grafting on root stock with low to moderate vigor.
Sensitivity to diseases and pests
Apart from grey rot, this vine variety displays no particular susceptibilities.
Technological potential
Grape clusters are small and the berries are very small. This vine variety produces high sugar content musts which are moderately acid.  It can be used to make fine sweet and dry wines.
Clonal selection in France
The 3 approved Courbu B clones carry the numbers 726, 727 and 812. A conservatory with close to 80 clones is managed in land plots located in Irouleguy and Jurançon (Atlantic Pyrenees).
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.
- Cépages et vignobles de France, tome 2. P. Galet, 1990, Ed. Dehan, Montpellier.
- Ampélographie. P. Viala et V. Vermorel, 1902-1910, Ed. Masson, Paris.
Description of clones approved in France
Identity and availability Agronomic data Technical data
Clone number Origin Selection Fertility Production level Sugar content Potential color
Year approved Agronomic references Weight of grape clusters Vigor Total acidity Tannic structure
Growing surface area Size of berries Sensitivity to Botrytis Aromatic intensity Oenological aptitudes
726  Pyrénées-Atlantiques  ENTAV        
 1980  Sud-Ouest        
         
Small distribution clone, conforms to vine variety characteristics
727  Pyrénées-Atlantiques  ENTAV        
 1980  Sud-Ouest        
         
Small distribution clone, conforms to vine variety characteristics
812  Pyrénées-Atlantiques  INRA      high  
 1985  Sud-Ouest        
     low    
Looser grape clusters