Isa B
Name of vine variety in France
Isa
Origin
This variety was obtained in 1964 by INRA by crossbreeding Gloria Hungariae B and Cardinal Rg.
Synonymy
There is no officially recognized synonym in France nor in other countries in the European Union.
Regulations
In France, Isa B is officially listed in the "Catalogue of vine varieties".

This variety is likewise listed in the Catalogue of Bulgaria.
Use
Table grape variety
Evolution of area under vines in France
2000 2008 2016
ha 11 11 5.2
Description
Identification signs include:
- the tips of the young shoot have a thin coat of flat-lying hairs,
-the young leaves are green with bronze patches,
- orbicular or pentagonal adult leaves, 5 or 7-lobed with a U- or V-shaped petiole sinus, slightly open or closed; V-shaped lateral sinuses with overlapping lateral lobes; moderate to long teeth with straight sides; absence of or low anthocyanin coloration of veins; smooth leafblade, slightly bubbled, jagged and the underside with a sparse cover of upright hairs on the veins and an absence of or slight cover of flat-lying hairs,
- round or short elliptical-shaped berries with a slightly aromatic or muscaté flavor
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 131 229 249 176 186 248 240 267 255
Allel 2 133 234 249 180 186 256 254 267 271
Phenology
Bud burst: 4 days before Chasselas.Grape maturity: period I, same as Chasselas.
Suitability for cultivation and agronomic production
Isa B has a moderate to strong vigor and semi-erect growth. This variety must be trained and managed with short pruning.
Sensitivity to diseases and pests
Isa B is slightly sensitive to powdery mildew.
Technological potential
The clusters are moderate size, supple and less compact. The berries are moderate to large size with fairly thin skin and pleasantly flavored and slightly muscaté firm pulp. To obtain a good golden coloring of the berries and prevent browning,  leaf thinning should be carried out in a moderate and not too intense fashion.  This variety has medium capacity for storage and long distance travel.
Clonal selection in France
The only approved Isa B clone carries the number 1031.
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.
- Dictionnaire encyclopédique des cépages. P. Galet, 2000, Ed. Hachette, 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
1031    INRA        
 1995