White wine grape variety grown in Apulia

Riesling b.

A variety of important national and international distribution, also found in Apulia, where it is listed among the varieties suitable in all the regions. 

Origin and Historical Outline

The white wine grape variety Riesling b. may have origins related to the Rhine valley and in particular to the Mosel, where it is also currently very cultivated. Until 1993 it was registered in the “National Register of Vine Varieties” under the name Rhine Riesling.

Its introduction in Italy dates back to the 19th century, with little diffusion. It was also introduced in Apulia. This grape variety differs from “Riesling italico”  both for the different morphological characters and for the characteristics of its wine.


Synonyms

Riesling renano, Riesling bianco, Riesling giallo, Riesling grosso (in Italia), Reno, Rhein Riesling, Gentil aromatique (in Francia), Starovetski (in Slovenia), Graschevina (in Croazia), Rajnai Rizling (in Ungheria), Rossling (in Germania), Johannisberg (negli Stati Uniti). 


Shoot tip: expanded, fluffy, whitish with light pink-purplish shades, the dorsal side of internodes is red, the ventral side is green streaked with red.

Leaf: medium, circular, often pentalobate. Vshaped petiole sinus with overlapping lobes. Narrow V or U-shaped upper and lower lateral sinuses.

Bunch: dense, small, short, cylindrical to pyramid shaped, also winged.

Berry: small, spheroidal. Golden to amber coloured skin, spotted with brown. Juicy flesh with special aroma and taste.

Time of bud burst: intermediate-early

Flowering time: intermediate

Veraison: early-intermediate

Ripening: intermediate-early

Isoenzymes

GPI: 5

PGM: 6

Vigour: considerable

Average bunch weight: 210 g (min 170 g – max 240 g)

Average berry weight: 1.3 g (min 0.8 g – max 2 g)

Number of seeds per berry: 1 4

Average rachis weight: 11 g

Fertility of buds: 2 – 1

Potential fertility: 1.5

Actual fertility: 1.1

 

Vine with a fair production. It gives its best results on medium-fertile, calcareous, fresh and not too compact soils. Prefers medium-short pruning and not too high training.

If grown in too wet areas, it is susceptible to rot and prone to coulure, especially in years with more difficult climate conditions. Also susceptible to drought. Fairly tolerant in relation to oidium, medium-susceptible to downy mildew, mildew and sour rot.

 

Alcoholic content: 10 – 13 % by vol.

pH: 3.1 – 3.5

Total acidity: 5 – 9 g/l

The Riesling b. grapes are used exclusively for vinification. The wine is straw yellow in colour with greenish highlights, fine, intensely fragrant and delicately aromatic, rightly acidic and alcoholic, sapid, dry, velvety and pleasant.

If the wine undergoes bottle ageing, it takes on a characteristic aroma, due to the formation of compounds such as trimethyldihydronaphthalene (TDN), known as “paraffin”.

The Riesling b. vine is present in Apulia and is registered among the varieties suitable for cultivation in all the production areas of the region.

Antonacci Donato
antonacci.dona@gmail.com

The data sheet of the Riesling b., revised and updated, is extracted from: Antonacci Donato (2006). Viti di Puglia, Adda publisher. Its use is granted by the author citing the source.