Merlot blanc B
Name of vine variety in France
Merlot blanc
Origin
This vine variety was developped in the Bordeaux region vineyards. Based on genetic analyses carried out in Montpellier, Merlot blanc B is derived from the crossbreeding of Folle blanche B and Merlot N.
Synonymy
No synonym is officially recognized in France for this variety, nor in other countries in the European Union.
Regulations
In France, Merlot blanc B is officially listed in the "Catalogue of vine varieties".
Use
Wine vine variety
Evolution of area under vines in France
1958 1968 1979 1988 1998 2008 2016
ha 5275 3662 1905 766 116 71 23
Description
Identification signs include:
- the tip of the young shoots has a heavy coat of flat-lying hairs,
- green young leaves,
- orbicular adult leaves, 5 or 7 lobes, an open petiolar sinus with a U-shaped base, deep lateral sinuses; long teeth compared to width at base with straight sides; an absence of anthocyanin coloration of veins, an upturned leaf blade, bubbled and the underside with a sparse to moderate coat of upright and flat-lying hairs,
- round-shaped berries.
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 149 223 239 186 194 252 248 227 239
Allel 2 149 234 247 188 196 260 248 245 271
Phenology
Bud burst: 2 days after Chasselas.

Grape maturity: period II, 3 weeks after Chasselas.
Suitability for cultivation and agronomic production
Merlot blanc B is very fertile, productive and steady. It is susceptible to drought.
Sensitivity to diseases and pests
Merlot blanc B is very susceptible to grey rot. Due to it being ungrafted in sand, it is heavily affected by eel worms.
Technological potential
Grape clusters are moderate size and the berries are small. Merlot blanc B produces relatively neutral and average quality wine.
Clonal selection in France
The only approved Merlot blanc B clone carries the number 1182.
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.
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
1182  Domaine de Vassal  INRA - IFV        
 2012          
         distinctive wines of the vine variety