Patent Publication Number: US-2003233690-P1

Title: Rose plant named &#39;Prerarol&#39;

Description:
BOTANICAL CLASSIFICATION/CULTIVAR DESIGNATION  
       [0001] Rosa hybrida  cultivar Prerarol  
       BACKGROUND OF THE INVENTION  
       [0002] The present invention relates to a new and distinct cultivar of Hybrid Tea Rose plant, botanically known as  Rosa hybrida,  and hereinafter referred to by the cultivar name Prerarol.  
       [0003] The new cultivar is a product of a planned breeding program conducted by the Inventor in Rijsenhout, The Netherlands. The objective of the breeding program was to develop new cut Rose cultivars with attractive flower colors, long and strong stems, dark green leaves, good production during the winter, and good postproduction longevity.  
       [0004] The new cultivar originated from a cross made by the Inventor in 1998 of two proprietary selections. The proprietary selection identified as code number P133, not patented, was the female, or seed, parent and the proprietary selection identified as code number 94-485, not patented, was the male, or pollen, parent. The cultivar Prerarol was discovered and selected by the Inventor as a flowering plant within the progeny of the stated cross in a controlled environment in Rijsenhout, The Netherlands.  
       [0005] Asexual reproduction of the new cultivar by cuttings taken at Rijsenhout, The Netherlands, has shown that the unique features of the new cultivar are stable and reproduced true to type in successive generations of asexual reproduction.  
       SUMMARY OF THE INVENTION  
       [0006] The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘Prerarol’. These characteristics in combination distinguish the new Hybrid Tea Rose as a new and distinct cultivar:  
       [0007] 1. Shiny dark green leaves.  
       [0008] 2. Long, strong and dark green flowering stems.  
       [0009] 3. Large dark red-colored flowers.  
       [0010] 4. Excellent postproduction longevity.  
       [0011] Compared to plants of the female parent, the selection P133, plants of the new Hybrid Tea Rose have darker red-colored flowers. Compared to plants of the male parent, the selection 94-485, plants of the new Hybrid Tea Rose have shorter flowering stems, longer postproduction longevity and are more resistant to Powdery Mildew.  
       [0012] Compared to plants of the cultivar Preratemp, U.S. Plant patent application filed concurrently with this application, plants of the new Hybrid Tea Rose have shorter flowering stems, longer postproduction longevity, and differ in flower color as plants of the cultivar Preratemp have red purple-colored flowers.  
       [0013] Plants of the Hybrid Tea Rose can be compared to plants of the cultivar Pekcoujenny, not patented. In side-by-side comparisons conducted by the Inventor in Rijsenhout, The Netherlands, plants of the new Hybrid Tea Rose differed from plants of the cultivar Pekcoujenny in the following characteristics:  
       [0014] 1. Plants of the new Hybrid Tea Rose had more thorns on the flowering stems than plants of the cultivar Pekcoujenny.  
       [0015] 2. Flowers of plants of the new Hybrid Tea Rose had more petals than flowers of plants of the cultivar Pekcoujenny.  
       [0016] 3. Flower color of plants of the new Hybrid Tea Rose was darker red than flower color of plants of the cultivar Pekcoujenny.  
       [0017] 4. Cut flowers of plants of the new Hybrid Tea Rose had much better postproduction longevity than cut flowers of plants of the cultivar Pekcoujenny.  
     
    
    
     BRIEF DESCRIPTION OF PHOTOGRAPH  
     [0018] The accompanying colored photograph illustrates the new Hybrid Tea Rose plant, showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photograph may differ slightly from the color values cited in the detailed botanical description which more accurately describe the actual colors of the new Hybrid Tea Rose. The photograph comprises a side perspective view of typical flowers and leaves of the new Hybrid Tea Rose grown in Rijsenhout, The Netherlands. 
    
    
     DETAILED BOTANICAL DESCRIPTION  
     [0019] Plants of the new Hybrid Tea Rose have not been observed under all possible environmental conditions. The phenotype may vary significantly with variations in environment such as temperature and light without, however, any variance in genotype.  
     [0020] The aforementioned photographs, following observations and measurements describe plants grown in Rijsenhout, The Netherlands, in glass-covered greenhouses with average day temperatures of 18° C. and average night temperatures of 17° C. Cut flowering stems used for the photographs and the description were about seven weeks old. In the following description, color references are made to The Royal Horticultural Society Colour Chart except where general terms of ordinary dictionary significance are used.  
     [0021] Classification:  
     [0022] Botanical.—Rosa hybrida  cultivar Prerarol.  
     [0023] Commercial.— Hybrid Tea Rose used as a cut flower.  
     [0024] Parentage:  
     [0025] Female, or seed, parent.— Proprietary selection of  Rosa hybrida  identified as code number P133, not patented.  
     [0026] Male, or pollen, parent.— Proprietary selection of  Rosa hybrida  identified as code number 94-485, not patented.  
     [0027] Propagation:  
     [0028] Type.— By vegetative cuttings.  
     [0029] Time to initiate roots.— About 12 days at 25° C.  
     [0030] Time to develop roots.— About 25 days at 25° C.  
     [0031] Root description.— Fine, fibrous and well-branched.  
     [0032] Plant description:  
     [0033] Form.— Upright; narrow; bushy.  
     [0034] Plant height.— About 100 cm.  
     [0035] Plant width.— About 40 cm.  
     [0036] Growth habit.— Moderately vigorous.  
     [0037] Flowering stems.— Quantity per plant: About 3 per plant. Length: About 80 cm. Diameter: About 1.25 cm. Internode length: About 7.5 cm. Texture: Glabrous; with thorns. Color: 147A. Thorns: Amount: Abundant. Height: About 5 mm. Diameter, at base: About 6 mm. Shape: Triangular. Color: Apex, 177A, fading to 177B towards the base.  
     [0038] Foliage description.— Arrangement: Alternate; compound with five to seven leaflets. Quantity per flowering stem: About 16 compound leaves. Leaf length: About 15 cm. Leaf width: About 10 cm. Terminal leaflet length: About 8 cm. Terminal leaflet width: About 6 cm. Leaflet shape: Ovate. Leaflet apex: Acute. Leaflet base: Obtuse. Leaflet margin: Serrate. Leaflet texture: Smooth, shiny. Leaflet venation pattern: Pinnate. Petiole length: To base of lower leaflet: About 4 cm. To base of terminal leaflet: About 9 cm. Petiole diameter: About 2 mm. Stipules: Two at either side of petiole base; less than 1 cm in length and about 1 mm in diameter; linear in shape. Color: Young foliage, upper surface: 200A. Young foliage, lower surface: 176A. Fully expanded foliage, upper surface: 139A. Fully expanded foliage, lower surface: 148B. Venation, upper surface: 139A. Venation, lower surface: 148C. Petiole and stipules: 137B.  
     [0039] Flower description:  
     [0040] Flower type and habit.— Large dark red-colored flowers. Consistently symmetrical rosette flowers. Freely and recurrent flowering habit. Flowers arranged singly at terminal apices or in sprays of 2 to 4 flowers and flower buds per spray. Flowers persistent.  
     [0041] Flowering season/time to flower.— Year-round under greenhouse conditions. Depending on environmental conditions and season, time to flower is about seven weeks.  
     [0042] Flower diameter.— About 10 cm.  
     [0043] Flower depth  ( height ).—About 5.5 cm.  
     [0044] Flower longevity on plant.— About 20 days.  
     [0045] Flower longevity as a cut flower.— About 14 days.  
     [0046] Fragrance.— Not detected.  
     [0047] Flower buds  ( at stage of showing color ).—Shape: Ovoid. Length: About 4.5 cm. Diameter: About 3.7 cm. Color: 53A.  
     [0048] Petals.— Quantity: About 42 per flower arranged in about 6 or 7 whorls. Length: About 5 cm. Width: About 5.5 cm. Shape: Orbicular. Apex: Mucronate. Margin: Entire, undulate, reflexed. Texture: Smooth, satiny. Color: When opening, upper and lower surfaces: 45B. Fully opened, upper and lower surfaces: 46A; color does not fade with subsequent development.  
     [0049] Sepals.— Quantity per flower: Five. Calyx length: About 4.4 cm. Calyx diameter: About 4 cm. Shape: Elongated, linear. Apex: Aristate. Margin: Mostly entire with random linear extensions, usually less than 1 cm in length. Texture: Smooth. Color: Upper surface: 144A. Lower surface: 146C. Peduncles: Strength: Strong. Aspect: Erect. Length: About 12 cm. Color: 147B. Reproductive organs: Stamens: Quantity per flower: About 104. Anther length: About 3.2 mm. Anther shape: Ovate. Anther color: 13B. Pollen amount: Moderate. Pollen color: 10B. Pistils: Quantity per flower: About 115. Style length: About 9 mm. Style color: 181A. Stigma color: 19B. Ovary color: 155B. Seed: Length: About 7 mm. Diameter: About 4.9 mm. Shape: Oval. Color: 159A.  
     [0050] Disease/Pest resistance: Resistance to Powdery Mildew has been observed on plants grown under commercial greenhouse production conditions. Plants of the new Hybrid Tea Rose have not been observed to be resistant to pests common to roses.