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AAC 576


Denomination: 'AAC 576'
Trade name: Canadian Shield
Botanical Name: Rosa
Applicant/Holder: Agriculture & Agri-Food Canada
Office of Intellectual Property and Commercialization
107 Science Place
Saskatoon, Saskatchewan
S7N 0X2
Breeder: Larry Dyck, AAFC, Morden Research Station, Morden, Manitoba
Agent in Canada: Vineland Research and Innovation Centre
4890 Victoria Avenue North
P.O. Box 4000
Vineland Station, Ontario
L0R 2E0
Tel: 905-562-0320
Application Date: 2016-08-04
Application Number: 16-8992
Grant of Rights Date: 2018-08-21
Certificate Number: 5801
Grant of Rights Termination Date: 2038-08-21

Variety Description

Variety used for comparison: 'Navy Lady'

Summary: The plants of 'AAC 576' have an intermediate between semi-upright and moderately spreading growth habit, and are shorter than those of 'Navy Lady', which have a semi-upright growth habit. The anthocyanin colouration of the young shoot of 'AAC 576' is of strong intensity while that of 'Navy Lady' is of medium intensity. The stem of 'AAC 576' has a medium number of prickles while that of 'Navy Lady' has many prickles. The upper side of the leaf of 'AAC 576' is medium green whereas the upper side of the leaf of 'Navy Lady' is light green. The flower of 'AAC 576' has a greater number of petals than that of 'Navy Lady'. The flower of 'AAC 576' is star-shaped while it is rounded for 'Navy Lady'. In profile, the lower part of the flower of 'AAC 576' is concave while it is flattened convex for 'Navy Lady'. The petal of 'AAC 576' is red while it is dark purple red for 'Navy Lady'.


PLANT: shrub type, intermediate between semi-upright and moderately spreading growth habit
YOUNG SHOOT: strong intensity of anthocyanin colouration
PRICKLES: medium number, reddish

NEWLY OPENED LEAF (UPPER SIDE): medium intensity of anthocyanin colouration
LEAF: medium green on upper side, no anthocyanin colouration, medium glossiness on upper side, medium undulation along margin
TERMINAL LEAFLET BLADE: medium elliptic, rounded base, acuminate apex

FLOWERING SHOOT: few flowering laterals, very few flowers per lateral
FLOWER BUD (OUTER SIDE): dark purple red (RHS 60A)
FLOWER: double type, red blend colour group, medium petal density, star-shaped when viewed from above, profile of lower part is concave, absent or weak fragrance, weak sepal extensions
PETAL: reflexing of petals one-by-one, rounded shape, absent or very weak incisions, absent or very weak undulation along margin, one colour on inner side, colour intensity is even, red (RHS 45B) on inner side, no secondary colour on inner side, red (RHS 46B) on outer side
BASAL SPOT (INNER SIDE): small, light yellow
OUTER STAMEN: light yellow filament
HIP: medium sized at petal fall

Origin & Breeding History: 'AAC 576' originated from a cross conducted by Larry Dyck, an employee of Agriculture and Agri-Food Canada, at the Morden Research Station in Morden, Manitoba. The cross was made in 2001 between female parent variety 'Y8' and male parent variety 'Frontenac'. In the spring of 2002, one seedling was selected and planted in the rose seedling field at the Morden Research Centre, further evaluated in 2003 and designated as '21Y8FR04'. This variety was selected based on its cold hardiness and black spot disease resistance. Initial cuttings were taken in 2004 and maintained in a greenhouse. Three of these were planted in the Morden Rose North Test Bed in 2006.

Tests & Trials: The comparative trial for 'AAC 576' was conducted as an outdoor trial during the summer of 2017 at Vineland Research and Innovation Centre in Vineland, Ontario. The trial included 6 plants each of the candidate and reference variety. Plants were grown from bare-rooted cuttings and transplanted into 11.4 litre containers in April 2015. Observations and measurements were taken from 6 plants, or 10 parts of 6 plants, of each variety on July 6, 2017. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'AAC 576' with reference variety 'Navy Lady'

Plant height, during second flowering (cm)

  'AAC 576' 'Navy Lady'
mean 37.7 51.2
std. deviation 5.47 3.54

Number of petals per flower (count)

  'AAC 576' 'Navy Lady'
mean 41 27
std. deviation 3.41 2.16

Main colour of petal (RHS)

  'AAC 576' 'Navy Lady'
inner side 45B 46A
outer side 46B 59A

Click on image for larger view
AAC 576
Rose: 'AAC 576' (top) with reference variety 'Navy Lady' (bottom)

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