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Denomination: 'Rosi'
Botanical Name: Solanum tuberosum
Applicant/Holder: IPR B.V.
P.O. Box 88
8500 AB
Breeder: R. P. Graveland, IPR B.V., Joure, Netherlands
Agent in Canada: HZPC-Americas Corp.
19 Regis Duffy Drive
Charlottetown, Prince Edward Island
C1E 0K5
Tel: 902-892-2004
Application Date: 2018-03-06
Provisional Protection:: 2018-03-06
Application Number: 18-9388

Variety Description

Varieties used for comparison: 'Mozart' and 'Cerata KWS'

Summary: The lightsprout of 'Rosi' is medium sized whereas those of 'Mozart' and 'Cerata KWS' are small. The base of the lightsprout of 'Rosi' has a strong to very strong intensity of anthocyanin colouration whereas that of 'Cerata KWS' has a medium to strong intensity of anthocyanin colouration. The base of the lightsprout of 'Rosi' has sparse pubescence whereas that of 'Mozart' has a medium density of pubescence and that of 'Cerata KWS' has dense pubescence. The plants of 'Rosi' are taller than the plants of 'Mozart' and shorter than the plants of 'Cerata KWS'. The tuber for 'Rosi' is short oval to oval in shape whereas it is round for 'Cerata KWS'. The tuber for 'Rosi' has cream coloured flesh whereas the tuber for 'Mozart' has medium yellow flesh and that of 'Cerata KWS' has white flesh.


LIGHTSPROUT: medium sized, ovoid, few root tips, short lateral shoots
LIGHTSPROUT BASE: strong to very strong intensity of anthocyanin colouration, medium proportion of blue in anthocyanin colouration, sparse pubescence
LIGHTSPROUT TIP: small in relation to base, closed habit, medium intensity of anthocyanin colouration, medium density of pubescence

PLANT: foliage structure is stem type where foliage is open and stems are clearly visible, upright to semi-upright growth habit, matures late in the season

STEM: high extent of anthocyanin colouration along entire stem

LEAF: medium sized outline, open, weak to medium presence of secondary leaflets, medium to dark green upper side, very high extent and strong intensity of anthocyanin colouration on upper side of midrib, low frequency of coalescence of terminal and lateral leaflets
SECOND PAIR OF LATERAL LEAFLETS: medium sized, leaflet is narrower than long
LEAFLET: weak degree of waviness of margin, shallow veins, dull on upper side, pubescence present on blade at apical rosette

PEDUNCLE: medium extent of anthocyanin colouration
INFLORESCENCE: medium frequency per plant, small to medium sized
FLOWER BUD: low extent of anthocyanin colouration
COROLLA: medium sized
COROLLA (INNER SIDE): high extent and medium to strong intensity of anthocyanin colouration, absent or low proportion of blue in anthocyanin colouration

TUBER: short oval to oval, cream coloured flesh
TUBER EYE: shallow, yellow at base

Origin & Breeding History: 'Rosi' originated from a cross between 'Symfonia', as the female parent, and 'Mozart', as the male parent, conducted in 2001 at the HZPC Research B.V. in Metslawier, Netherlands. 'Rosi' was selected from the resulting F1 in 2002, based on yield, internal and external tuber quality, and disease resistance.

Tests & Trials: The comparative trial for 'Rosi' was conducted by Global Agri Services Inc. during the 2019 growing season in Drummond, New Brunswick. The trial consisted of a single, 21 metre long row per variety. Each row contained 70 plants spaced 0.3 metres apart with inter row spacing of 0.9 metres. Measurements were taken from 10 plants, or 10 parts of plants, of each variety. The mean differences were significant at the 5% probability level based on a paired Student's t-test.

Comparison table for 'Rosi' with reference varieties 'Mozart' and 'Cerata KWS'

Plant height (cm)

  'Rosi' 'Mozart' 'Cerata KWS'
mean 36.5 33.0 57.9
standard deviation 3.1 3.1 1.9

Click on image for larger view
Potato: 'Rosi' (right) with reference varieties 'Cerata KWS' (left) and 'Mozart' (centre)

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