Denomination: 'Yokingsville'
Trade name: Kingsville
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: 2007-09-28
Application Number: 07-6015
Grant of Rights Date: 2011-03-17
Certificate Number: 4028
Date rights surrendered: 2015-01-22

Variety Description

Variety used for comparison: 'Yocovington' (Covington)

Summary: 'Yokingsville' has a very short corolla tube while 'Yocovington' has a short corolla tube. 'Yokingsville' has a slightly larger flower head diameter than 'Yocovington'. The ray florets of 'Yokingsville' are convex at the apex while the ray florets of 'Yocovington' are concave at the apex.


PLANT: spray flowering type, pot plant, 8 week response group, upright to semi upright bushy growth habit, stem green tinged with purple or brown

LEAF: terminal lobe long in length relative to leaf length, lowest lateral lobe sinus medium in depth with touching and overlapping margins, base truncate and asymmetric, upper side medium green

FLOWER HEAD: double, dense ray florets
RAY FLORETS: ligulate with an incurved secondary type, very short corolla tube, moderately concave in cross section at widest point becoming convex at apex, straight along longitudinal axis, emarginate and mamillate tip, inner side yellow (RHS 5B), outer side yellow green (RHS 4C)

Origin & Breeding History: 'Yokingsville' originated from a controlled cross between the female parent 'YB-A0406' and the male parent, 'YB-A0351'. The cross was made by the breeder, Mrs. Wendy Bergman, in January 2001 in Salinas, California, USA. A single seedling from the resultant progeny was selected in March 2002, in Fort Myers, Florida. 'Yokingsville' was selected based on its semi-upright and uniform growth habit, flowering response time, flower type, flower colour, production characteristics and excellent post-production longevity. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in June 2002.

Tests & Trials: Trials for 'Yokingsville' were conducted in Leamington, Ontario, in the fall of 2009. Flowering trials were performed under greenhouse conditions similar to those used in commercial chrysanthemum production. Forty unrooted cuttings of both the candidate and reference variety were directly stuck into 15 cm pots, with 4 cuttings per pot, 10 pots per variety, planted on August 24, 2009. 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 6, 2009. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Yokingsville' with reference variety 'Yocovington'

Flower head diameter (cm)

  'Yokingsville' 'Yocovington'
mean 10.3 9.8
std. deviation 0.25 0.50

Colour of ray floret (RHS)

  'Yokingsville' 'Yocovington'
inner side 5B 5B
outer side 4C 5C

Click on image for larger view
Chrysanthemum: 'Yokingsville' (left) with reference variety 'Yocovington' (right)

Click on image for larger view
Chrysanthemum: 'Yokingsville' (left) with reference variety 'Yocovington' (right)

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