Rose plant--Carola

Abstract

A rose plant exhibiting good resistance to powdery mildew, and being characterized by nonfragrant flowers, very high crop, good self-rooting and high stem break forth.

Description

This application is a continuation application of application Ser. No. 07/387,837, filed Aug. 1, 1989, now abandoned.

FIELD OF THE INVENTION

The present invention is concerned with a new variety of hybrid tea rose discovered by me and being a mutation of Deladel (U.S. Plant. Pat. No. 4,391, dated Mar. 6, 1979), Madame G. Delbard variety.

SUMMARY OF THE INVENTION

The mutation was first discovered on a cultivated area, in a farm located in South America, at an altitude of about 2,400-2,500 meters above sea level, with average night temperature of 5-8 degrees centigrade, and day temperature of 5-18 degrees centigrade.

Plants were grown in a green-house, and then brought to Israel, where they were vegetatively propagated by selfrooting of cuttings.

Asexual reproduction of this new cultivar as performed at Yuval Agriculture Products at Moshav Ha'Yogev shows that the foregoing characteristics and distinctions came true to form and are established and transmitted through succeeding propagations.

The resulting plants were found to be stable in their botanical characteristics, as are described below and in the attached drawing.

The following is a description of the characteristics of my new rose cultivar which distinguish it from cultivars of which I am aware and especially from Madame G. Delbard (Deladel):

1. Better branching.

2. Larger flower bud.

3. Distinct larger number of petals.

4. Larger sepals with larger extensions.

5. More water shoots, than the original plant.

6. Good grafting compatibility on Rosa indica L.

BRIEF DESCRIPTION OF THE DRAWING

The first sheet of the drawing depicts buds of the claimed plant in various stages of opening; the characteristic shape and foliaceous appendages of the sepals are shown along with the high-centered character of the buds themselves. The coloration of the other surfaces of the petals at this stage of opening is also depicted.

The second sheet of drawing shows, in comparison, two petals of Carola, designated as A at the top of the drawing, and petals of comparable stage of maturity as taken from the parent variety "Deladel", labelled B, at the bottom of the drawing. This sheet of drawing also depicts the typical difference in size of the petals taken from the mutation as compared to the parent variety; and, also shows the difference in the size of the spot at the point of petal attachment; that of the parent "Deladel" being much smaller in the comparison; and the difference in coloration; that of the sport being clear white while that of the parent being light yellow in color.

DETAILED DESCRIPTION OF THE INVENTION

The following is a detailed description of my new rose cultivar with color in terminology in accordance with Royal Horticultural Society of London, England (R.H.S.) Colour Chart except where ordinary dictionary significance of color is indicated.

The plant originated from a mutation of Madame G. Delbard.

The following description is based on observations made in Moshav Ha'Yogev, Israel, in a greenhouse:

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Plant      growth habit   upright
Older stem                corky1
Young shoot
anthocyanin    strong
coloration
hue of anthocyanin
purple
coloration
Prickles                  present
Prickle    shape of upper straight
sides
shape of lower side
concave
Short prickles
number         few
Long prickles
number         few
Leaf       size           length 140-170 mm
width 110-150 mm
green color    medium to dark
glossiness of upper
absent or very weak
side
Leaflet    cross section  slightly convex
undulation of  absent or very weak
margin
Terminal leaflet
length of blade
ca. 60 mm
maximum width  ca. 35 mm
length of petiole
ca. 20 mm
shape of base  rounded
Flowering shoot
number of flowers
few
Flowering habit           continuous
Flower pedicel
number of hairs or
few
prickles
Flower bud longitudinal   circular to ovoid
section
Flower     type           double
number of petals
33-40
diameter       ca. 110 mm
view from above
rounded to star-
shaped
side view of upper
flattened-convex
part
side view of lower
flat
part
fragrance      none
Sepal      length         40-55 mm
extensions     strong
Petal      size           length 50-60 mm
width 55-65 mm
shape          rounded
color of middle
RHS 53-A dark red
zone of inner side
(according to the
Royal Horticultural
Society Color
Chart)
color of marginal
RHS 53-A dark red
zone of inner side
spot at base of
present
inner side
size of spot at
medium (length of
base of inner side
spot on the upper
side of the petal
was 8-10 mm
color of spot at
white (RHS 155-D)
base of inner side
color of middle
RHS 53-C dark red
zone of outer side
color of marginal
RHS 53-C dark red
zone of outer side
spot of base of
present
outer side
size of spot at
very small to small
base of outer side
color of spot at
white
base of outer side
reflexing of margin
strong
undulation of  weak
margin
Stamen     predominant color
purple
of filament
length         long
predominant color
purple
hairiness of upper
medium
half
position as    above
compared with
anthers
size           medium
shape of       pitcher shaped
longitudinal
section
______________________________________
1 Typical for hybrid tea roses.

The time of beginning of flowering is early.

The average number of petals per flower: 33-38.

The bud size at time of picking is 5-6 cm long, and 3 cm in diameter.

The number of side shoots per flowering branch is 5-6.

The annual produce is 150-160 flowers per square meter.

Flowering stem medium green, 70-80 cm long with an average of 13 leaves.

The vase life is up to 15 days, under condition of room temperature.

Average number of water shoots, in 1st year after planting 4-6.

Prickles, per internode -- 2-3.

Prickles up to 3rd leaf -- 1.

Number of leaflets per leaf -- 5-7.

Budding sprout -- 8-9.

Fragrance -- none.

Plant's height in 8 months after planting 170-180 cm.

Time from planting to commercial flower production 6-8 months.

Good resistance to Rose Powdery Mildew.

Exhibits high stem break forth, very high crop and good self-rooting.

Under condition of room temperature flower opening proceeds

Under condition of room temperature flower opening proceeds slowly.

The variety should be grown under glass.

Comparison Of Production Characteristics Between The New Variety "Carola" and Variety "Deladel"

Observations made in Ecuador from commercial plantings during 1988-1990, where the two varieties were grown side by side, under the same conditions and same age, were both self-rooted and with the same planting time. Each one 10,000 square meters of plants.

______________________________________
Carola   Deladel
______________________________________
Average number of petals
33-38      18-25
Average number of cut flowers
1.85-2.00  0.90-1.25
per plant per month (year
round production)
Average number of water-
4-6        2-3
shoots in first year after
planting
Plant height in 8 months
170-180 cm 80-90 cm
after planting
Size of spot at base of inner
medium     very small
side
Color of spot at base of
white      yellow
inner side of petal
(RHS 155-D)
Fragrance of flower
none       slight, not
sweet or spicy
Time from planting to
6-8 months 10-12 months
commercial flower production
Grafting compatibility on
very good  very poor
Rosa indicia L.   (about 65%
success)
______________________________________

The size of the spot was, for the variety `Carola` defined

as: size of spot at base of inner side of petal-medium, and size of spot at base of outer side of petal-very small to small, using the sketch of the Test Guidelines for Rose of the Union for Protection of New Plant Varieties (document TG/11/4)-applying the following calculation:

[1+{(average length of spot/average length of petal)-1}]/(35-1)*8

With lower value of length of spot 1 mm, and higher value of length of spot 35 mm.

Statistical Analysis For Additional Observations Made In Ecuador In Order To Compare Carola With Deladel

______________________________________
Carola
Deladel
______________________________________
Number of petals:
standard deviation 7.77    3.92
mean               32.05   22.35
Plant height in 8 months:
standard deviation 0.13    0.10
mean               1.97    1.50
Basal shoots:
standard deviation 1.48    0.67
mean               3.00    1.32
Flowers per plant:
standard deviation 0.53    0.48
mean               1.76    1.17
______________________________________

In all tests of the examined characteristics, the conclusion was that the population differ with a high level of significance.

Comparison Of Production Characteristics Between The New Variety Odem And Variety Carola

The new variety Odem is a variety that was subsequently discovered and is a spot of Carola. They differ as described below:

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Odem      Carola
______________________________________
Average number of petals
39-48       33-38
Size of petal
length            37-45 mm    50-60 mm
width             39-49 mm    55-60 mm
Flower
diameter          ca. 80 mm   ca. 100 mm
color of upper side
RHS 46-AB   RHS 53-A
Petal's reflexing medium      strong
Size of spot at base of inner
small       medium
side of petal
Color of spot at base of inner
yellow      white
side
Length of flowering stem
50-70 cm    70-90 cm
Thickness of flowering stem
medium      thick
Number of flowering stems per
about double
plant per year    as for
Carola
______________________________________

Claims

1. A new and distinct variety of rose plant of a hybrid tea rose, variety, named Carola, as shown and described, and consisting mainly of plants being vigorous growing, showing a large flower bud, containing a large number of petals, having nonfragrant with petals with a medium-sized white spot at their base, with early and prolific flower production, and having fast and good propagating features.