Couston N
Name of the variety in France
Couston
Origin
This variety comes from a natural sowing discovered by Mr. Julien Couston in the beginning of the 1970's in the French department of Ardèche. Based on genetic analyses carried out in Montpellier, this variety would be the result of the crossbreeding between Grenache and Aubun.
Synonyms
There is no officially recognized synonym in France nor in the other countries of the European Union, for this variety.
Legal information
In France, Couston is officially listed in the "Catalogue of vine varieties" on the A list and classified.
Use
Wine grape variety.
Evolution of cultivated areas in France
2018
ha 13.4
Descriptive elements
The identification is based on:
- the tip of the young shoot with a low density of prostate hairs,
- the green young leaves,
- the circular or wedge-shaped adult leaves, entire or with three lobes, with an open U-shaped petiole sinus, with sometimes a tooth inside the petiole sinus, small to medium teeth with straight sides, no anthocyanin coloration of veins, a twisted involute leaf blade, and on the lower side of the leaves, no or a very low density of erect and prostate hairs,
- the ellipsoid 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: mid-season, 3 weeks and a half after Chasselas.
Suitability for cultivation and agronomic production
Couston is vigorous, fertile, with a semi-erect bearing and is well adapted to short pruning. In drying climatic conditions, berries are susceptible to shrivelling as maturity approaches.
Susceptibility to diseases and pests
Couston is susceptible to downy mildew and not very sensitive to grey rot.
Technological potentiality
Couston's bunches are medium in size and moderately compact. The berries are also medium in size. The sugar accumulation potential is very high. Couston produces full-bodied, very tannic, very warm and very colored wines.
Clonal selection in France
The only certified Couston clone carries the number 1129.
Bibliographic references
- Documentary collections of the Centre de Ressources Biologiques de la Vigne de Vassal-Montpellier, INRAE - Montpellier SupAgro, Marseillan, France.
Description of clones certified in France
Identity and availability Agronomic data Technological data Autres informations
Clone no. Marque Origin Selection Year of
certification
Agronomic
references
Surface area used
for propagation (year)
Fertility Production
level
Bunch
weight
Vigor Berry
size
Susceptibility
to grey rot
Sugar
level
Color
potential
Titrable
acidity
Tannic
structure
Aromatic
intensity
Oenological
suitability
New General
note
Agro-tecnic
note
Note
agronomique
Agronomic
note
Links
1129 Ardèche CA 07 - IFV 2009 Ardèche Clone consistent with the characteristics of the variety.