Couston N
Name of vine variety in France
Couston
Origin
This variety is derived from the natural sowing discovered by Mr. Julien Couston in the beginning of the 1970's. Based on genetic analyses carried out in Montpellier, this vine variety was dribved from the crossbreeding of Grenache and Aubun N.
Synonymy
There are no officially recognized synonyms in France, nor in other countries in the European Union.
Regulations
In France, Couston N is officially listed in the "Catalogue of vine varieties".
Use
Wine grape variety.
Description
Identification signs include:
- the tip of the young shoot has a sparse coat of flat-lying hairs,
- the young leaves are green,
- orbicular or wedge-shaped adult leaves, whole or 3 lobes with an open U-shaped petiolar sinus occasionally with the presence of a tooth at the base, small to moderate size teeth with straight sides, an absence of anthocyanin coloration of veins; a jagged leaf blade, upturned and the underside with an absence or very slight coat of flat-lying and upright hairs,
- elliptical-shaped berries.
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 131 229 239 176 188 252 240 243 239
Allel 2 143 238 257 191 194 258 240 257 261
Phenology
Bud burst: 3 days before Chasselas.Grape maturity: period II, 3 and 1/2 weeks after Chasselas.
Suitability for cultivation and agronomic production
Couston N is vigorous and has good fertility, grows erect and is well adapted to being short-pruned. When exposed to drying climatic conditions, the berries are susceptible to wilting when approaching grape maturity.
Sensitivity to diseases and pests
Couston N is not too susceptible to downy mildew and not very susceptible to grey rot.
Technological potential
Couston N grape clusters are of moderate size and compactness. The berries are likewise moderate size with very high sugar accumulation potential. Couston N produces full-bodied, tannic, very warm and very colored wines.
Clonal selection in France
The only approved Couston N clone carries the number 1129.
Bibliographic references
- Documentation interne du Domaine de Vassal. 1949-2011, INRA, Marseillan-plage.
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
1129  Ardèche  CA 07 - IFV        
 2009  Ardèche        
         
Clone conforms to variety characteristics