Mother: Diana (Silvaner x Müller-Thurgau)
Father: Chambourcin (J.S. 26 205: = Villard blanc x Chancellor (Seibel 7053))

A red Piwi/disease-resistant variety.
It is one of the most important new disease-resistant quality grape varieties world-wide and supplies colour-intensive strong red wines.

Year of breeding: 1967, by Professor Dr. Gerhardt Alleweldt
Country of origin: Germany
Breeder/License holder: Bundesforschungsanstalt für Rebenzüchtung Geilweilerhof,
                                 at Siebeldingen/Rheinpfalz
Number of clones: 1 (GF1)
Named after the famous Regent diamond from India

Year of entry into the German Federal Office's Varieties Register: 1995/1996
Area planted in Germany in 2000: 350 hectares, and in 2004: 2037 hectares
Area planted in England (as at August 2004): large numbers of vines have been planted.

Wine Character - colour: deep red
                      - bouquet: 
                      - palate: full bodied, Bordeaux style, sometimes hints of blackcurrant

Time of bud-burst: in Germany earlier than Müller-Thurgau; in UK it is late

Strength of growth: medium, fairly upright
Growth of side-shoots: low

Flowering time: 
Flowering strength: medium

Leaf: - size:                                         - shape: 
        - colour: 
        - surface undulation:                     - petiolar sinus: 

Grape bunch: - size: medium                  - density: medium
Berries:        - size: small to medium      - shape: 
                   - skin colour: red-blue (the juice is coloured)
The berries fall off when very ripe.

Time of veraison: 
Time of harvest: middle-early

Grape yield: medium (slightly above Pinot Noir)
Must-weight: high (2 Oe above Pinot Noir)
Must-acidity: medium (3 g/l below Pinot Noir)

Wood ripening: 
Winter hardiness: 
Wood colour: 

Chlorosis resistance: 
Susceptibility to - Oidium: low                  - Peronospora: very low
                       - Botrytis: low                 - Roter Brenner: high
                       - Phomopsis:                   - Stem-atrophy: 

Preferred soil: susceptible to magnesium deficiency.
Suitable rootstocks: according to the soil.

Normal stem height: 
Normal row spacing: 1.8 to 2.0m
Vine spacing in the row: 

Winter Pruning: 8 to 10 eyes/buds per sq. metre of land occupied by the plant.

Advantages: Probably the most disease-resistant red wine variety.
A short fermentation on the skins is sufficient for colour extraction. Very high quality wine.

Disadvantages: Cold and windy sites should be avoided (to minimise coulure).

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