Dark Yoroanoke


Denomination: 'Dark Yoroanoke'
Trade name: Dark Roanoke
Botanical Name: Chrysanthemum ×morifolium
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Wendy Bergman, Syngenta Flowers, Inc., Alva, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2006-03-31
Application Number: 06-5404
Grant of Rights Date: 2010-03-19
Certificate Number: 3815
Date rights surrendered: 2015-01-22

Variety Description

Variety used for comparison: 'Yodavis' (Davis)

Summary: The leaves of 'Dark Yoroanoke' are shorter than those of 'Yodavis'. 'Dark Yoroanoke' has larger flower heads and longer ray florets than 'Yodavis'. The upper side of the ray florets of 'Dark Yoroanoke' are blue pink with darker blue pink diffuse stripes and mottling while those of 'Yodavis' are violet with blue pink mottling.


PLANT: year round cultivation for pot production, pinched type, spray flowering type, 8 week response group
STEM: green

LEAF: obtuse base, diverging margins of sinus between lateral lobes, medium green

FLOWER HEAD: semi-double daisy type, chromatic colour type, red to purple colour group, medium density of ray florets
RAY FLORET: ligulate, very small corolla tube, reflexing longitudinal axis of majority, weak curvature, convex in cross section, dentate and mamillate tip, blue pink with darker blue pink in diffuse stripes and mottled on upper side, white to light blue violet (RHS 76D) with violet (RHS 75B) along middle and blue pink (RHS N74D) along keel on lower side
DISC: yellow green before anther dehiscence, medium yellow at anther dehiscence
DISC FLORETS: enlarged tubular type, massed in the center

Origin & Breeding History: 'Dark Yoroanoke' originated from a naturally occuring whole plant mutation of the parent variety 'Yoroanoke'. The new variety was discovered and selected by the breeder, Mrs. Wendy Bergman, in December 2001, in Fort Myers, Florida, United States. Selection of 'Dark Yoroanoke' was based on plant growth habit, inflorescence form, floret and foliage colour, response time and suitability for production. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fort Myers, Florida, United States in March 2003.

Tests & Trials: Trials for 'Dark Yoroanoke' were conducted in Leamington, Ontario, in the fall of 2008. Flowering trials were performed under greenhouse conditions similar to those used in commercial chrysanthemum production. Forty unrooted cuttings of both the candidate and reference varieties were directly stuck into 15 cm pots, with 4 cuttings per pot, 10 pots per variety, planted August 18, 2008. Plants were spaced 30 cm apart and pinched once prior to short day treatment. All plants had the center bud removed. Observations and measurements were taken from 10 plants of each variety on November 3, 2008. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Dark Yoroanoke' with reference variety 'Yodavis'

Leaf length (cm)

  'Dark Yoroanoke' 'Yodavis'
mean 7.5 9.1
std. deviation 0.50 0.60

Flower head diameter (cm)

  'Dark Yoroanoke' 'Yodavis'
mean 7.0 6.4
std. deviation 0.23 0.25

Colour of upper side of ray florets (RHS)

  'Dark Yoroanoke' 'Yodavis'
main N74D more purple than 75B
secondary 71D fading to 72D N74C-D

Click on image for larger view
Dark Yoroanoke
Chrysanthemum: 'Dark Yoroanoke' (left) with reference variety 'Yodavis' (right)

Click on image for larger view
Dark Yoroanoke
Chrysanthemum: 'Dark Yoroanoke' (left) with reference variety 'Yodavis' (right)

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