<i>Prunus </i>rootstock tree named ‘Dhprs2’

Abstract

A new and distinct variety of Prunus rootstock tree that exhibits desirable disease resistance and induces a high yield of large fruits for grafted varieties.

Claims

1. A new and distinct variety of Prunus rootstock plant, as illustrated and described herein.

Description

DESCRIPTION OF THE DRAWINGS

(1) The accompanying photographic drawings illustrate the new variety at approximately 4 years of age, with the color being as nearly true as possible with color illustrations of this type.

(2) FIG. 1 illustrates numerous plants of ‘Dhprs2’;

(3) FIG. 2 illustrates the flowers of ‘Dhprs2’;

(4) FIG. 3 illustrates the fruit of ‘Dhprs2’; and

(5) FIG. 4 illustrates sliced fruit of ‘Dhprs2’.

DETAILED BOTANICAL DESCRIPTION

(6) The following detailed description sets forth the characteristics of the new cultivar at approximately 6 years of age. The data which defines these characteristics were collected as a result of asexual reproductions carried out in Freising, Germany. ‘Dhprs2’ is compatible with at least varieties of Prunus domestica and Prunus salicina and induces a high yield of large fruits for grafted varieties. ‘Dhprs2’ is fully resistant to the Plum pox virus (PPV/Sharka) by means of hypersensitivity resistance. Further, the new variety exhibits good resistance to plum decline caused by Pseudomonas bacteria. ‘Dhprs2’ exhibits medium vigor (similar to Prunus rootstock variety named ‘Weiwa’—unpatented) with only a few suckers present. Its leaf blades are narrow, serrate, elliptical in shape, and of medium length. Its flower petals are pure white in color. ‘Dhprs2’ can be useful as a rootstock for grafting of PPV resistant varieties, as well as with varieties that are PPV sensitive. Color references are primarily to The R.H.S. Colour Chart of The Royal Horticultural Society of London and were identified under natural light. Rootstock: Size: Medium. Vigor: Moderate. Tree habit: Spreading. Pathogen resistance: Resistant to the Plum pox virus (PPV/Sharka) and good resistance to Pseudomonas bacteria. Rootstock performance: Root sprouts (suckering).—Few. Anchorage.—Good. Compatibility.—Very good with Prunus domestica; also compatible with Prunus salicina. Vigor.—Moderate (70% with Prunus cerasifera). Bearing: Regular. Type of bearing: On spurs and long shoots, but mostly on spurs. Trunk: Length.—60.0 cm. Width.—60.0 mm (measured at 30.0 cm from ground level). Lenticels.—Length: Average of 3.0 mm. Width: Average of 0.8 mm. Number: Average of 3.2 per square centimeter. Branches: One year old shoot color.—Brown-violet. Diameter.—Average of 12.0-15.0 mm. Color.—RHS N200C. Lenticels.—Length: 0.9-1.2 mm. Width: 0.1-0.2 mm. Number: Average of 1.8 per square millimeter. Color: RHS N199C. Leaves: Length.—64-70 mm. Width.—42-49 mm. Form.—Elliptic. Base.—Obtuse-truncate. Apex.—Apiculate. Margin.—Crenate-serrate. Mature leaf color.—Upper surface: RHS 137A. Lower surface: RHS 137C. Petiole.—Length: 11-14 mm. Diameter: 1.5-1.8 mm. Color: RHS N77A. Veins.—Venation type: Reticulate. Color: RHS 141D. Vegetative buds: Spur length.—Average of 32.0 mm. Bud length.—Average of 1.5 mm. Bud diameter.—Average of 0.4 mm. Flowers: Bud length.—Average of 1.9 mm. Bud diameter.—Average of 0.8 mm. Fruit: Ripening time.—Begins in the middle of September in Freising, Germany. Bloom on skin.—Present. Area of fruit over color.—100%. Skin color.—RHS 202A. Flesh color.—RHS 152B. Stalk length.—6.5-9.8 mm. Stalk color.—RHS 145A. Symmetry.—Slightly asymmetric. Base.—Slightly depressed. Apex.—Slightly depressed. Depth of stalk cavity.—0.5 mm. Lenticels.—Average of 2 per square millimeter. Lenticel size.—Less than 0.5 mm. Fruit firmness.—Medium. Sweetness.—15-17 Brix. Stone.—Adherence: Little to no adherence to flesh. Length: 20.4-20.8 mm. Breadth: 12.0-12.6 mm. Thickness: 7.4-7.8 mm. Shape in lateral view: Narrow elliptic to elliptic. Shape in ventral view: Elliptic. Shape in basal view: Elliptic. Texture of lateral surfaces: Hammered. Width of stalk end: Very narrow. Tree winter hardiness: High. Bud winter hardiness: High. Drought tolerance: Good.