Plant Variety Journal - IP Australia

Details of Application
Application Number 2006/101
Variety Name ‘Kortraste’
Genus Species Rosa hybrid
Common Name Rose
Synonym Nil
Accepted Date 21 Jul 2006
Applicant W. Kordes’ Sohne Rosenschulen GmbH & Co KG, Klein
Offenseth-Sparrieshoop, Germany
Agent Treloar Roses Pty Ltd, Portland, VIC
Qualified Person Brian Hanger
Details of Comparative Trial
Overseas Testing
Authority
Bundessortanamt
Overseas Data
Reference Number
Ros 2286
Location Pruistelle Rethmar, Germany. Local observation at Portland,
VIC
Descriptor Rose (Rosa hybrid) TG/11/7
Period 2003-2004
Conditions The comparative study was conducted at Portland (Latitude
38.15S, Longitude 141.37E), VIC. The roses were maintained
in the open and grown in a well structured loamy clay soil.
Sound farm management practices ensured the plants grew to
their full potential with minimum stress and under high health
conditions. ‘Kortraste’ was budded in early summer onto well
established 10 month-old Rosa multiflora rootstock.
Trial Design
Examination was conducted in mid-autumn 2008 on one and
two year old budded plants growing in double rows along
with other varieties of Kordes roses.
Observations and measurements were taken from a minimum
of ten plants, selected at random in mid autumn.
Measurements Measurements made on terminal leaflet of first five-leaflet
leaf down flower stem, flower diameter when first fully open,
and sepal length excluding leafy extension if present.
RHS Chart - edition 1986
Origin and Breeding
Controlled pollination: in 1991 seed parent ‘The Fairy’ was crossed with pollen parent
unnamed seedling. Hips produced remained on the bush until Oct (autumn) when
harvested and shelled. The following year, seeds were planted under controlled
greenhouse condition. Germination commenced in Feb, and the seedlings first
bloomed in Apr (Northern Hemisphere). From this seedling population, the best were
selected for further trials. After these trials, the seedling, now known as ‘Kortraste’,
was selected for further evaluation. Budding eyes were taken in Jul 1992 and budded
to root stock R. canina and planted out in the open. Multiplication and testing
continued until 2002. ‘Kortraste’ was released in 2003. This new variety was
multiplied in number by vegetative propagation over numerous generations.
‘Kortraste’ has proved to be genetically stable. Selection criteria: improved garden
rose variety. Breeding directed by William Kordes, of W.Kordes' Sohne Rosenschulen
GMBH & Co KG, Sparrieshoop,Germany.
Page 404 of 550
Plant Varieties Journal Vol. 21 No.3