Seyval B
Name of vine variety in France
Seyval
Origin
Seyval B or 5276 Seyve-Villard (interspecific hybrid) is derived from the crossbreeding of 5656 Seibel and Rayon d’Or B (or 4986 Seibel).
Synonymy
In France, this vine variety is officically called "5276 Seyve-Villard" for plant propagating material.
Regulations
In France, Seyval B is officially listed in the "Catalogue of vine varieties".

This vine variety is likewise listed in the Catalogues of other European Union member states: Great Britain, Netherlands and Romania.
Use
Wine vine variety
Evolution of area under vines in France
1958 1968 1998 2008 2016
ha 1309 1288 159 119 91
Description
Identification signs include:
- the tip of the young shoot has a moderate coat of flat-lying hairs,
- the young leaves are green with bronze patches,
- orbicular shaped leaves with a slightly open U-shaped petiolar sinus or closed with overlapping lobes; small to moderate size teeth with convex sides; a shiny and upturned leaf blade and the underside with a sparse coat of flat-lying hairs,
- flat or round-shaped berries.
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 131 223 237 186 178 260 236 235 249
Allel 2 131 250 243 186 188 262 236 251 271
Phenology
Bud burst: 3 days after Chasselas.
Grape maturity: period II, 2 and 1/2 weeks after Chasselas.
Suitability for cultivation and agronomic production
Seyval B is vigorous and fertile. It can be short pruned or moderately long pruned and preferably trained.
Sensitivity to diseases and pests
Seyval B resists moderately well to downy mildew. It is slightly susceptible to grey rot and it must be grafted.
Technological potential
Grape clusters are small to moderate size. The berries are likewise small to moderate and very bloomed. Seyval B produces acceptable quality wines. 
Clonal selection in France
There are no approved clones for this vine 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, 1988, Ed. Dehan, Montpellier.