Siyana
| Variety Passport | |
| Country of origin: | Bulgaria |
| Breeder: | The "Obraztsov Chiflik" Institute |
| Variety number VIVC: | 23204 |
| Prime name: | Siyana |
| Year of obtaining / registration: | 1987 |
| Pedigree given by breeder: | Todorov 3-32 (Bolgar x Alphonse Lavallee) S.P. |
| Pedigree confirmed by markers: | Todorov 3-32 x Todorov 3-32 |
| Species: | Vitis vinifera |
| Ripening period: | Late |
| Classification and Use: | Table, Commercial sale, Fresh consumption, Long-term storage |
| Resistance group: | Susceptible |
| Data Sources: | Vitis International Variety Catalogue (VIVC), ИЗС Образцов чифлик (Bulgaria) |
| Agrobiology | |
| Vigor: | vigorous |
| Flower type: | hermaphrodite |
| Downy mildew susceptibility: | 4 points (highly susceptible) |
| Powdery mildew susceptibility: | 4 points (highly susceptible) |
| Winter hardiness: | Non-hardy (-15...-17°C) |
| Pruning length: | medium, 5-8 buds |
| Clusters and berries | |
| Bunch density: | loose |
| Average bunch weight: | 530 g |
| Berry shape: | oval, oblong |
| Berry skin color: | black |
| Average berry weight: | 10 g |
| Seed development: | seeded |
| Flesh texture: | firm / crunchy |
| Berry skin thickness: | medium |
| Berry skin texture: | medium |
| Sugar content: | 17% |
| Total acidity: | 5.4 g/l |
| Flavor type: | Neutral |
| Ampelographic overview |
Key Characteristics
The late-ripening table grape variety Siyana was bred by specialists at the Bulgarian Institute of Agriculture and Seed Science "Obraztsov Chiflik" in the city of Ruse. Consumer maturity of the harvest under Bulgarian conditions occurs in mid-October. The grape variety Siyana is characterized by high and stable productivity, with average yields of about 20 tons per hectare (2 tons per decare).
This variety forms large clusters with an average weight of 530 grams. The cluster structure is loose, which reduces the risk of berry deformation. The berries are distinguished by an exceptionally large size, with the average weight of a single berry reaching 10 grams. The pulp has a pronounced crunchy texture, and the taste is harmonious, simple (neutral). Inside the berry, there are usually two medium-sized seeds.
Technological Properties and Viticultural Features
During the harvest maturity period, the grape variety Siyana demonstrates an optimal balance of sugar content and acidity: the average sugar accumulation is 17%, while the titratable acidity of the berry juice remains at 5.4 g/l. The skin is firm and black in color.
The variety Siyana possesses strong commercial potential. The harvested crop is capable of remaining on the vines for a long time after ripening without any deterioration in the marketability or taste qualities of the fruit. The grapes tolerate long-distance transportation without damage and are suitable for long-term storage for winter sales. The grape variety Siyana is recommended for cultivation exclusively in the warmest viticultural regions of the country, which can provide the required sum of active temperatures for late-ripening varieties.