Extra
| Variety Passport | |
| Country of origin: | USA |
| Variety number VIVC: | 4021 |
| Prime name: | Extra |
| Year of obtaining / registration: | 1886 |
| Pedigree confirmed by markers: | Big Berry x Triumph |
| Species: | Interspecific hybrid |
| Ripening period: | Mid-season |
| Classification and Use: | Dual-purpose, Fresh consumption, Juice Production |
| Resistance group: | Complex resistant |
| Data Sources: | Vitis International Variety Catalogue (VIVC), Виноград на Дальнем Востоке (Л. Я. Лебедева изд. 1989) |
| Agrobiology | |
| Vigor: | vigorous |
| Flower type: | hermaphrodite |
| Downy mildew susceptibility: | 3 points (low resistance) |
| Powdery mildew susceptibility: | 2 points (resistant) |
| Botrytis susceptibility: | 2 points (resistant) |
| Winter hardiness: | High frost resistante (-24...-26°C) |
| Clusters and berries | |
| Bunch shape: | cylindro-conical |
| Bunch density: | loose |
| Average bunch weight: | 83 g |
| Berry shape: | rounded |
| Berry skin color: | black |
| Seed development: | seeded |
| Flesh texture: | mucilaginous |
| Berry skin thickness: | Thick |
| Berry skin texture: | tough |
| Sugar content: | 13,9-16,8% |
| Total acidity: | 9-13 g/l |
| Berry Flesh Color: | Non-colored |
| Flavor type: | Labrusca |
| Ampelographic overview |
General Characteristics
Extra is a grape variety of American origin (Vitis Labrusca). The Extra grape variety is used for fresh consumption and is also suitable for ornamental purposes. In the Russian Far East, it occurs as individual bushes in homestead vineyards and in the collections of experimental stations. The fruits are distinguished by an attractive appearance of both bunches and berries; the taste is sweet and sour, pleasant, slightly astringent, with a distinct strawberry aroma. The average yield when cultivated on the Alpha variety rootstock in the Primorsky Krai is 73 centners/ha, which exceeds some early hybrids in terms of productivity.
Morphological Description
- Leaf: large, rounded and cordate, three-lobed, slightly cleft. The upper surface of the leaf blade is shiny and reticulate-wrinkled. Strong cobwebby pubescence is observed on the lower side of the leaf.
- Petiole sinus: almost completely closed, with a slit-like opening, or vaulted and narrow.
- Flower: bisexual.
- Bunch: medium-sized, conical or cylindrical with a wing, loose in structure. The average bunch weight is 83 g.
- Berry: medium-sized, rounded, less frequently oval. The skin color is light pink. The pulp is mucilaginous, and the juice is uncolored (clear). The skin is durable, thick, and covered with a distinct waxy bloom.
Agrotechnical Features
The Extra grape variety is characterized by strong bush growth and good shoot maturation. The yield per bush varies from 1.4 to 5.4 kg. In the southern part of the Primorsky Krai, the variety is capable of wintering on its own roots, accumulating up to 17–19% sugar. When harvested under regional conditions, the sugar content of the must ranges from 13.9 to 16.8% with a titratable acidity of 9–13 g/l. Resistance indicators to downy mildew (mildew) are significantly higher compared to European varieties and European-Amur hybrids. The Extra grape variety is cultivated jointly with the Russkiy Konkord variety, for which it acts as an effective pollinator.