Jurançon blanc B
Name of vine variety in France
Jurançon blanc
Origin
This vine variety is originally from the south west of France. Although close, it is not the white form of Jurançon noir N. Based on genetic analyses carried out in Montpellier, Jurançon blanc B is derived from the crossbreeding of  Folle blanche B and Pruéras B.
Synonymy
No synonym is officially recognized in France for this variety, nor in other countries in the European Union.
Regulations
In France, Jurançon blanc B is officially listed in the "Catalogue of vine varieties".
Use
Wine and eaux-de-vie vine variety
Evolution of area under vines in France
1958 1968 1979 1988 2000 2008 2016
ha 5755 1968 641 137 21 12 4.3
Description
Identification signs include:
- the tip of the young shoots has a heavy coat of flat-lying hairs
- adult leaves are orbicular, 5 lobes with a slightly open petiolar sinus or with slightly overlapping lobes, open lateral sinuses with a U-shaped base; short teeth compared to width at base, straight sides, low to moderate anthocyanin pigmentation of veins and the underside with a  moderate coat of upright and flat-lying hairs,
- round-shaped berries.
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 131 223 239 176 186 244 238 245 239
Allel 2 149 232 239 178 196 256 248 267 271
Phenology
Bud burst: 7 days after Chasselas.
Grape maturity: period II, 3 and 1/2 weeks after Chasselas.
Suitability for cultivation and agronomic production
Jurançon blanc B has moderate vigor, grows very upright and can be pruned short.
Sensitivity to diseases and pests
Jurançon blanc B is very susceptible to downy mildew and grey rot.
Technological potential
Grape clusters are small and the berries are moderate in size. Jurançon blanc B produces low quality, acid and low alcohol level wine. The  eaux-de-vie produced from this wine are average in quality and not very aromatic.
Clonal selection in France
There are no clones for this variety at the present time.
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 1. P. Galet, 1990, Ed. Dehan, Montpellier.