Apple tree rootstock named ‘D2212’

Abstract

A new and distinct variety of apple tree rootstock that exhibits compatibility with numerous apple varieties and resistance to Candidatus Phytoplasma mali and Athelia rolfsii.

Claims

1. A new and distinct variety of apple tree rootstock named ‘D2212’, as is herein illustrated and described.

Description

DESCRIPTION OF THE DRAWINGS

(1) The accompanying photographic drawings illustrate the new variety with the color being as nearly true as possible with color illustrations of this type.

(2) FIG. 1 illustrates multiple plants of the new variety at approximately 1 year of age;

(3) FIG. 2 illustrates multiple young plants of the new variety; and

(4) FIG. 3 illustrates the new variety at 7 years of age with fruits thereon.

DETAILED BOTANICAL DESCRIPTION

(5) The following detailed description sets forth the characteristics of the new variety at approximately 1 year of age and on a mother plant at 7 years of age. The data which defines these characteristics were collected as a result of asexual reproductions carried out in Rheinstetten, Germany on potted plants under standard growing conditions and taken under natural light. Where applicable, color descriptions are provided using X11 Color Names and their corresponding HEX Color Codes, accessed in August of 2022 via www.farbtabelle.de/de/farbtabelle.htm.

ROOTSTOCK

(6) Height: 150.0 cm. Thickness: 12.0 mm. Vigor: Medium. Tree habit: Upright and straight growth. Form: Spindle. Use: Solely as a rootstock. Multiplication ability: Layering.—Not determined to date. Hardwood cuttings.—Very difficult. Softwood cuttings.—Possible, but with low yields. Pathogen resistance: Resistant to Candidatus Phytoplasma mali and Athelia rolfsii. Pest resistance/susceptibility: Not observed to date. Rootstock performance: Root sprouts (suckering).—None. Anchorage.—Stable in the ground. Compatibility.—Compatible with all varieties known to the inventor. Vigor.—Medium to strong. Shoot: Diameter.—Thick at midpoint, but difficult to measure as very dependent on age and soil conditions. Internode length.—Medium to long; average of 2.75 cm. Texture.—Pubescence present on upper half of shoot. Glossiness of bark.—Medium to strong. Color.—Red, HEX #973307 on sunny side. Growing tip color.—Maroon, HEX #800000. Buds: Position.—Adpressed relative to axis. Size.—Length from 6.0-10.0 mm and width from 4.0-5.0 mm. Shape of tip.—Pointed. Support size.—Small to medium. Lenticels: Quantity.—Average; approximately 10 lenticels per 2.0 cm shoot length. Length.—Medium to long; average of 1.0 mm. Shape.—Elliptic. Color.—Burlywood 1, HEX #ffd39b. Petiole: Shape.—Straight. Length.—2.0 cm; 3.5 length of blade to length of petiole ratio. Diameter.—0.15 cm. Color.—Upper surface is sienna, HEX #a0522d; lower surface is red3, HEX #cd0000. Leaves: Arrangement.—Alternate, spiral. Length.—From 6.5 to 7.0 cm. Width.—From 5.0 to 6.0 cm. Form.—Generally, elliptic-oval. Lower base leaves are often triangular with basal lobes. Profile.—Concave in cross section. Apex.—Pointed. Base.—Orbicular-obtuse. Margin.—Serrate. Texture.—Upper surface is smooth; lower surface has weak pubescence present. Color.—Upper surface is OliveDrab4, HEX #698b22; lower surface is DarkOliveGreen3, HEX #a2cd5a; young leaves have bronze, HEX #cd7f32 anthocyanin coloration present. Venation.—Type: Pinnate, alternate. Color: On expanding leaves, slightly reddish with very weak to weak anthocyanin coloration present, both colors being tomato2, HEX #ee5c42. Flower buds: Pedicel.—Length: 4.5 cm. Diameter: 1.0 mm. Color: Tan4, HEX #8b5a2b. Bud.—Shape: Obtuse, with a blunt tip. Length: 1.0 cm. Width: 4.0 mm. Color: HotPink, HEX #ff69b4. Flowers: Bloom timing.—From April 23 to May 8 in Rheinstetten, Germany. Blooming period.—Two weeks. Number of flowers per cluster.—4 to 6. Fragrance.—Weakly sweet. Petals.—Number: 5. Length: 2.5 cm. Width: 1.7 cm. Shape: Orbicular. Apex: Round. Base: Round and tapering to the center of the base. Margin: Entire. Texture: Smooth. Color.—When opening: Upper surface: Pink1, HEX #eea968. Lower surface: MistyRose, HEX #ffe4el. Fully opened: Upper surface: White, HEX #ffffff. Lower surface: Light Pink1, #ffaeb9. Sepals.—Shape: Rhomboid. Apex: Triangular, long, and pointed. Margin: Entire. Texture: Smooth. Length: 4.0 to 5.0 mm. Width: 1.0 mm. Color: Upper surface: OliveDrab4, HEX #698b22. Lower surface: OliveDrab3, HEX #9acd32. Reproductive organs: Stamens.—Number (per flower): 12. Filament length: 3.0 mm. Anthers.—Shape: Round. Length: 1.0 mm. Color: Gold3, HEX #cdad00. Pollen.—Color: Gold3, HEX #cdad00. Amount: Scarce. Pistils.—Average number: 4. Length: 2.4 cm. Style.—Length: 7.0 mm. Color: Cornsilk3, HEX #cdc8b1. Stigma.—Shape: Round. Color: NavajoWhite3, HEX #cdb38b. Fruit: Not observed to date.