Grape Variety: Trousseau gris
Variety Name |
Trousseau gris |
TTB Approved Name(s) |
Trousseau gris |
Common Synonyms |
Gray Riesling |
All Synonyms |
Chauche gris, Gray Riesling, Grey Riesling, Gris de Salces, Terret d'Afrique |
Countries of Origin |
France |
Species |
Vitis vinifera
|
Pedigree |
Mutation of Trousseau |
References |
- Christensen, L et al. 2003. Wine Grape Varieties in California. University of California Agriculture and Natural Resources Publication 3419.
- Robinson, Jancis, Julia Harding, José Vouillamoz. WINE GRAPES. First U.S. edition, 2012. Harper Collins Publishers, East 53rd Street, New York, New York.
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Berry Color |
Grey |
Uses |
Wine |
Comments |
Trousseau gris is a light-colored mutation of Trousseau, which has black fruit. For many years, Trousseau gris was incorrectly referred to in California as Grey Riesling. Trousseau gris was once significant in the Charante region of France. |
Trousseau gris PhotosClick photo to enlarge
Trousseau gris Selections
How Selection Numbers are Created
Questions are often asked as to how Foundation Plant Services (FPS) decides which number to assign to the grape selections in the foundation vineyard and whether those numbers relate to particular clones that may be the sources of the FPS selections.
The answer for most selections in the FPS foundation vineyard is that selection numbers are assigned by the next available (unused) number in sequence for that variety. There is nothing magical about it. For example, the first Sauvignon blanc selection that came to FPS in 1958 was named Sauvignon blanc FPS 01. The next Sauvignon blanc arrival received the name Sauvignon blanc FPS 02. Gaps in the numbering system in the current list of available selections mean that the omitted number was taken out of circulation for some reason, such as death from disease.
FPS intentionally chose the word "selection" rather than "clone" when referring to the products offered in the foundation vineyard. The word "clone" can be confusing and ambiguous. The major European collections have formal evaluation protocols for grape material to qualify material for release as an official "clone". Evaluation criteria includes field performance and wine making characteristics.
FPS does not perform formal clonal evaluations on the grapevine materials accepted for the foundation vineyard. The word "selection" at FPS simply means the material was collected from a single source vine from the vineyard of origin, whether within the United States or from a foreign vineyard. Some of our numbered selections have been through trials here in California but FPS does not conduct those trials or evaluations.
Having said that, there is a subgroup of selections at FPS that are official numbered clones from the formal clonal development programs in Europe. Those official clones are imported and sold by the owners as proprietary (trademarked) clonal material in the United States. The owners are large government or nursery entities in Europe, such as the ENTAV-INRA® clonal material from the IFV program in France. In order to preserve the identity of those clones, FPS agreed to assign them the same official clone number that the program in Europe gave them when released there. Cabernet Sauvignon 685 from France received the name Cabernet Sauvignon ENTAV-INRA® 685 at FPS. The owners of those proprietary clones are the ones who vouch for or affirm the authenticity of their trademarked clones.
Lastly, there is a small subset of "clones" that came to FPS in the 1980's prior to the establishment of the trademark programs for the European clones. Those clones also came to the United States associated with clone numbers assigned when the clones were developed in Europe. Many of the French clones in that group were developed at Dijon in France and the material has been known as the "Dijon clones". Those French clones were not protected by an official trademark program at the time they came to the United States. Some of those clones are no longer used in France and some were incorporated into the ENTAV-INRA trademark program.
FPS refers to this subset of clones as "generic clonal material". FPS agreed that we would assign those non-proprietary clones a new number at FPS rather than the European clonal number. They received their FPS numbers using the "next in order" rule. We may have a note on the plant description that the selection is "reported to be a certain French clone number". FPS cannot guarantee that such a selection is the official French clone number that it was formally associated with in France.
Registration Status Definitions
Provisional Status
Provisional Status is an important term used in the regulations of the California Department of Food & Agriculture's Grapevine Registration & Certification Program. Grapevine selections with Provisional Status have successfully completed all required disease testing, but have not been confirmed as true to variety. Propagation material from Provisional selections qualifies for release subject to the understanding on the part of the customer that the identity has yet to be confirmed.
Registered Status
Registered is the ultimate status in the California Department of Food & Agriculture's Grapevine Registration & Certification Program. Registered selections have successfully completed all disease testing required by the regulations. Registered selections have also been confirmed as true to variety by experts using visual observations, DNA-based testing or both.
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Trousseau gris 01
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Registration Status |
Registered
Registered is the ultimate status in the California Department of Food & Agricultures Grapevine Registration & Certification Program. Registered selections have successfully completed all disease testing required by the regulations. Registered selections have also been confirmed as true to variety by experts using visual observations, DNA-based testing or both.
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Source |
Gray Riesling FPS 01, from a California vineyard (Barra) |
Treatments |
None , Tissue Culture Excision
|
Comments |
The name was changed in 2003 from Gray Riesling FPS 01 to Trousseau gris 01; TTB phased out the name Gray Riesling. |
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Trousseau gris 02
|
Registration Status |
Registered
Registered is the ultimate status in the California Department of Food & Agricultures Grapevine Registration & Certification Program. Registered selections have successfully completed all disease testing required by the regulations. Registered selections have also been confirmed as true to variety by experts using visual observations, DNA-based testing or both.
|
Source |
Gray Riesling FPS 02, from a California vineyard (Cella) |
Treatments |
None , Tissue Culture Excision
|
Comments |
The name was changed in 2003 from Gray Riesling FPS 02 to Trousseau gris 02; TTB phased out the name Gray Riesling. |
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Trousseau gris 02.1
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Registration Status |
Provisional
Provisional Status is an important term used in the regulations of the California Department of Food & Agriculture's Grapevine Registration & Certification Program. Grapevine selections with Provisional Status have successfully completed all required disease testing, but have not been confirmed as true to variety. Propagation material from Provisional selections qualifies for release subject to the understanding on the part of the customer that the identity has yet to be confirmed.
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Protocol 2010 |
Qualifies for Protocol 2010.
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Treatments |
Tissue Culture Excision
|
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Trousseau gris 03
|
Registration Status |
Registered
Registered is the ultimate status in the California Department of Food & Agricultures Grapevine Registration & Certification Program. Registered selections have successfully completed all disease testing required by the regulations. Registered selections have also been confirmed as true to variety by experts using visual observations, DNA-based testing or both.
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Source |
Trousseau gris (formerly Gray Riesling) FPS 02, which was from a California vineyard (Cella) |
Treatments |
Heat treatment 43 days
|
Comments |
The name was changed from Gray Riesling FPS 03 to Trousseau gris FPS 03 in 2003; TTB phased out the name Gray Riesling. |
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Trousseau gris 07
Top
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Registration Status |
Registered
Registered is the ultimate status in the California Department of Food & Agricultures Grapevine Registration & Certification Program. Registered selections have successfully completed all disease testing required by the regulations. Registered selections have also been confirmed as true to variety by experts using visual observations, DNA-based testing or both.
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Source |
Former UC Foothill Experiment Station in Jackson, California |
Treatments |
None
|
Comments |
This selection came to Foundation Plant Services in 1965 from University of California's former Foothill Experiment Station in Jackson, Amador County, California. The plant material was at location K8v6 at the station under the name(s) Johannisberger Riesling or Chauche gris. It originally came from the former experiment station at Berkeley in 1889 and was planted in that year at the Foothill Station. When the plant material arrived at FPS in 1965, it was given the name Grey Riesling FPS 07. The name was changed from Gray Rielsing FPS 07 to Trousseau gris FPS 07 in 2003. DNA tests conducted at FPS showed that this selection matched references for Trousseau gris, not for Riesling. |