Grapevine plant named ‘KERSUS’

Abstract

A new grape variety distinguished by its high vigour, circular shaped leaves, medium weight fruit clusters, early-medium harvesting time (end of August in northeastern Italy), green dorsal and ventral internodes, and resistance to downy mildew and powdery mildew.

Claims

1. A new and distinct variety of Vitis vinifera L. plant substantially as illustrated and described herein.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a photograph showing a shoot a leaf of the new variety Kersus taken on May 24, 2017, in Rauscedo, Italy.

(2) FIG. 2 is a photograph showing a leaf of the new variety Kersus taken on May 24, 2017, in Rauscedo, Italy.

(3) FIG. 3 is a photograph showing fruit of the new variety Kersus taken on Aug. 24, 2016, in Rauscedo, Italy.

(4) FIG. 4 is a photograph showing a plant of the new variety Kersus taken on Aug. 24, 2016, in Rauscedo, Italy.

(5) The color photographs show typical specimens of the new variety and depict the color as nearly true as is reasonably possible to make the same in a color illustration of this character. It should be noted that colors may vary, for example due to lighting conditions at the time the photograph is taken. Therefore, color characteristics of this new variety should be determined with reference to the observations described herein, rather than from the photograph alone.

DETAILED DESCRIPTION

Botanical

(6) The following detailed description of the KERSUS variety is based on observations of asexually reproduced progeny. The observed progeny are plants which were 3-5 years of age. The following detailed description concerns the plants growing in an open field taken in Rauscedo, Italy in 2016-2018. The original plant and progeny have been observed growing in a cultivated area in Rauscedo, Italy, with medium texture soil that is rich in skeleton and alluvial in nature. Temperatures in Rauscedo, Italy range from a high of 29 C. to a low of 2 C. Average rainfall is 822 mm per year, with an average rainfall during the growing season (April-September) of 453 mm. The chart used in the identification of colors described herein is The R.H.S. Colour Chart, 5.sup.th edition, except where general color terms of ordinary significance are used. The color values were determined in August-September 2018 under natural light conditions in Rauscedo, Italy. Scientific name: Vitis vinifera L. Parentage: Seed parent.Sk-00-1/7. Pollen parent.Pinot Blanc. Plant: Vigor.High. Growth habit.Semi-erect. Trunk: Diameter at 50 cm.3.1 cm (6 yr-old plants). Bark texture.Striate. Bark coloration.RHS 187A. Mature cane: Diameter.9.6 mm. Bark texture.Ribbed. Bark coloration.RHS 179C. Shoot: Opening of the shoot tip.Fully open for young shoot. Distribution of the anthocyanin coloration of the prostrate hairs of the shoot tip.Absent. Density of prostate hair on the shoot tip.Medium-to-high. Attitude (before tying).Semi-erect. Color of the dorsal side of internodes.Green 140B. Color of the ventral side of internodes.Green 140B. Distribution of anthocyanin coloration on the bud scales.Absent. Number of consecutive tendrils.2 or less. Tendrils: Length.21.9 cm. Diameter.2.4 mm. Color.RHS 150A. Leaves: Shape.Circular. Ratio length/width of teeth.Small (Marsanne), both sides convex. Arrangement of lobes of upper lateral sinuses.Absence of sinus (Melon). Blistering.Medium-to-strong blistering of upper side of mature blade. Size of blade.Medium (Cabernet Sauvignon); average length 121 mm; average width 181 mm. Young leaf.Color of upper surface is green RHS 134B, color of the lower surface RHS 142C, with sparse prostrate hairs between main veins on the lower side of blade. Mature leaf.Color of upper surface is dark green RHS N134A, color of the lower surface RHS 140B, with sparse prostrate hairs between main veins on the lower side of blade. Mature leaf.Three lobes. Area of anthocyanin coloration of main veins on upper side and lower of mature blade.Absent. Area of anthocyanin coloration of main veins on lower side of mature blade.Absent. Goffering/depressions of mature blade between the main veins.Absent or very weak (Gamay). Profile of mature leaf in cross section.V-shaped. Degree of mature leaf opening of petiole sinus.Closed. Shape of base of petiole sinus.Brace-shaped ({)-to-V-shaped. Petiole sinus base limited by vein.Not limited. Petiole length compared to length of middle vein.Equal (Garnacha tinta). Petiole average length.117.5 mm. Petiole color (upper surface).RHS 145B and RHS 184D. Petiole color (lower surface).RHS 145B and RHS 184D. Density of prostrate hairs on petiole.None or very low. Density of erect hairs on petiole.None or very low. Depth of upper lateral sinuses.Absent or very shallow; average depth of the sinus 35.2 mm. Flower bud: Shape.Round. Size.Average. Color.Light brown. Bud burst.Beginning of April in Rauscedo, Italy. Flowers: Fully developed stamens and fully developed gynoecium. Insertion of 1st inflorescence.3rd and 4th node. Number of inflorescences per shoot.1 to 2. Flowering period (time of beginning of flowering).Beginning of June in Rauscedo, Italy. Average flower diameter.2 mm. Inflorescence average length.155 mm. Inflorescence average width.121 mm. Fruit: Cluster.Low weight (about 260 g), cylindrical with one or two middle size wings, compact. Time of beginning of berry ripening.Early. Berry shape.Globose. Berry length.Short (about 13 mm). Berry width.Narrow (about 13 mm). Berry bloom.Medium. Thickness of berry skin.Medium-to-thick. Color of skin (without bloom).Yellow green 150C. Texture.Soft flesh. Flesh color.RHS 150C. Anthocyanin coloration of flesh.Absent or very weak. Flavor.None/neutral. Berry shipping quality.N.a. Berry storage quality.N.a. Formation of seeds.Complete. Average number of seeds.2-3. Seed size.Medium (Pinot noir, Merlot). Seed color.Brown RHS 200C. Harvest time.Early-medium (end of August in northeastern Italy). Bunch length (peduncle excluded).Medium (about 160 mm; Syrah). Bunch width.Narrow (about 80 mm; Riesling, Sauvignon). Bunch density.Dense. Length of peduncle of primary bunch.Very short-to-short (up to about 30 mm; Silvaner). Color of peduncle.RHS 156A and RHS N200A. Diameter of peduncle.4-5 mm. Lignification of peduncle.Up to about the middle. Berry hilium.Visible. Pedicel: Average length.9-12 mm. Average diameter.1-1.5 mm. Color.RHS 145B. Grape juice characteristics: Sugars (brix).21.1. PH.3.4. Total acidity.6.2 g/l. Tartaric acid.6.57 g/l. Malic acid.1.89 g/l. Production characteristics: Clusters per shoot.1.42. Grape production.3467 g/plant. No. of bunches/vine (at harvest).15.2. Average weight of the bunch.262.7 g. Average berry weight.1.57 g. Pruning wood weight.690 g/plant. Index of ravaz.5.02. Wine produced from grapes: Total acidity.5.3 g/l. Tartaric acid.2.5 g/l. PH.3.37. Net extract.20.0 g/l. Alcohol.12.8 g/l. Volatile acidity.0.2 g/l. Reducing sugars.1.1 g/l.

(7) TABLE-US-00002 TABLE 2 Molecular Analysis VVS2 VVMD5 VVMD7 N + 10 N + 14 N + 10 N + 16 N + 12 N + 26 VVMD25 VVMD27 VVMD28 N + 6 N + 14 N + 10 N + 14 N + 20 N + 28 VVMD32 VRZAG62 VRZAG79 N + 5 N + 5 N + 14 N + 20 N + 2 N + 24

(8) Use international coding based on N (see European project GENRES 081A basis for the preservation and utilization of Vitis genetic resources) Phenological characteristics (in Rauscedo, Italy): Germination.April 4. Flowering.June 2. Veraison (change of color).August 7. Maturation.September 9. Use: Wine grape. Disease/pest resistance: Resistance to downy mildew and powdery mildew.