Yosun City


Denomination: 'Yosun City'
Trade name: Pointe Pelee
Botanical Name: Chrysanthemum ×morifolium
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Peter Wain, Southampton, United Kingdom
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2005-04-05
Application Number: 05-4687
Grant of Rights Date: 2007-11-22
Certificate Number: 3023
Grant of Rights Termination Date: 2025-11-22

Variety Description

Variety used for comparison: 'Yobaton Rouge' (Baton Rouge)

Summary: 'Yosun City' has taller plants and larger diameter flower heads with longer ray floret blades than 'Yobaton Rouge'.


PLANT: year round cultivation for pot production, spray flowering type, 8 week response group, medium to tall
STEM: no anthocyanin colouration

LEAF: medium length, medium width, broad wedged to truncate base
LATERAL LOBE: mostly diverging margins of sinus
LOWER LOBE: medium to long, medium to deep sinus

FLOWER HEAD: single, daisy type, bicoloured red and yellow, medium to large diameter, no bracts among ray florets
RAY FLORET: medium length blade with short corolla tube, straight to reflexed longitudinal axis of majority, flat to weakly convex in cross-section, dentate tip, upper side is red to dark purple red with yellow at base and along margins from base, lower side is yellow with grayed brown purple mostly at apical end
DISC: yellow green before anther dehiscence, yellow after anther dehiscence, small diameter
DISC FLORET: tubular type, numerous, massed, clearly visible at all stages of flower head development, yellow

Origin & Breeding History: 'Yosun City' is a product from a planned breeding program conducted by the breeder, Mr. Peter Wain, an employee of Fides Goldstock Breeding in De Lier, The Netherlands. It originated from a cross made in January 2001 in Fareham, Hampshire, United Kingdom between a proprietary Chrysanthemum seedling selection designated 'P130E 1' as the female parent and Chrysanthemum variety 'Los Almos' as the male parent. 'Yosun City' was selected by the breeder in 2001 in Fareham, Hampshire, United Kingdom based on its uniform plant growth habit, desirable inflorescence form and floret colours, fast response time and excellent post production longevity.

Tests & Trials: Trials for 'Yosun City' were conducted in the fall of 2006 at Yoder Canada Ltd. in Leamington, Ontario. They were performed under greenhouse conditions similar to those used in commercial Chrysanthemum production. 40 unrooted cuttings per variety were directly stuck into 15 cm pots with 4 cuttings per pot and 10 pots per variety. The pots were spaced 30 cm apart. The plants were pinched once prior to short day treatment. All plants had the centre bud removed. Measured characteristics were based on measurements taken from 10 plants or parts of plants on November 1, 2006. All colour determinations were made using the 2001 Royal Horticulture Society (RHS) Colour Chart.

Comparison tables for 'Yosun City' with reference variety 'Yobaton Rouge'

Plant height (cm)

  'Yosun City' 'Yobaton Rouge'
mean 24.4 18.7
std. deviation 1.65 1.42

Flower head diameter (cm)

  'Yosun City' 'Yobaton Rouge'
mean 9.3 6.1
std. deviation 0.56 0.44

Ray floret blade length (cm)

  'Yosun City' 'Yobaton Rouge'
mean 4.2 2.8
std. deviation 0.20 0.13

Click on image for larger view
Yosun City
Chrysanthemum: 'Yosun City' (left) with reference variety 'Yobaton Rouge' (right)

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