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Nonpareil Russet


Denomination: 'Nonpareil Russet'
Previously Proposed Denomination: 'CO98067-7RU'
Botanical Name: Solanum tuberosum
Applicant/Holder: Colorado State University Research Foundation
P.O. Box 483
Fort Collins, Colorado
United States of America
Breeder: David Holm, Colorado State University, Center, United States of America
Agent in Canada: Canadian Eastern Growers Inc.
399 ch 1er rang
DSL de Drummond, New Brunswick
E3Y 2S8
Tel: 506 479-2188
Application Date: 2018-07-19
Provisional Protection:: 2018-07-19
Application Number: 18-9584
Grant of Rights Date: 2020-11-02
Certificate Number: 6312
Grant of Rights Termination Date: 2040-11-02

Variety Description

Varieties used for comparison: 'Russet Burbank' and 'Maritime Russet'

Summary: The lightsprout of 'CO98067-7RU' is medium to large whereas that of 'Russet Burbank' is small. The shape of the lightsprout of 'CO98067-7RU' is conical whereas it is spherical for 'Russet Burbank' and ovoid for 'Maritime Russet'. The base of the lightsprout of 'CO98067-7RU' has a medium intensity of anthocyanin colouration whereas that of 'Maritime Russet' has a weak intensity of anthocyanin colouration. In relation to the base, the size of the lightsprout tip for 'CO98067-7RU' is small while that of 'Russet Burbank' is large. The leaflet for 'CO98067-7RU' has a weak waviness of margin while it is absent or very weak on the leaflet of 'Russet Burbank'. The plants of 'CO98067-7RU' are taller than those of both reference varieties. The frequency of inflorescence is medium for 'CO98067-7RU' whereas it is low for 'Russet Burbank'. The depth of the eyes on the tuber is shallow for 'CO98067-7RU' whereas it is deep for 'Russet Burbank' and of medium depth for 'Maritime Russet'. The tuber of 'CO98067-7RU' has cream coloured flesh while that of 'Maritime Russet' has white flesh.


LIGHTSPROUT: medium to large, conical shape, medium number of root tips, short lateral shoots
LIGHTSPROUT BASE: medium intensity of anthocyanin colouration, absent or low proportion of blue in anthocyanin colouration, medium density of pubescence
LIGHTSPROUT TIP: small in relation to base, closed habit, absent or very weak to weak intensity of anthocyanin colouration, sparse pubescence

PLANT: intermediate to leaf type foliage structure where foliage is half open to closed with stems partly to hardly visible, semi-upright growth habit, mid-season to late maturity

STEM: absent or very low extent of anthocyanin colouration

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

PEDUNCLE: absent or very low extent of anthocyanin colouration
INFLORESCENCE: medium frequency per plant, small to medium size
FLOWER BUD: low extent of anthocyanin colouration
COROLLA: medium to large
COROLLA (INNER SIDE): absent or very low extent of anthocyanin colouration, absent or very weak intensity of anthocyanin colouration, absent or low proportion of blue in anthocyanin colouration

TUBER: long oval to long, cream coloured flesh
TUBER EYE: shallow depth, yellow at base
TUBER SKIN: reddish brown

Origin & Breeding History: 'CO98067-7RU' originated from a cross between 'Silverton Russet', as the female parent and 'Top Cat', as the male parent, conducted at the Colorado State University San Luis Valley Research Center, in Center, Colorado, USA, in 1998. In 1999, the true potato seed resulting from the cross was sown in a greenhouse and the resulting seedling tubers field planted in Center, Colorado. In 2000, 'CO98067-7RU' was identified. Selection criteria was based on negative mass selection for agronomic characteristics and disease resistance.

Tests & Trials: The comparative trial for 'CO98067-7RU' was conducted by Global Agri Services Inc. during the 2018 growing season in Drummond, New Brunswick. The trial consisted of a single, 21 metre long row containing 70 plants spaced 0.3 metres apart for each variety. The distance between rows within the trial was 0.9 metres. Observations and measurements were taken from 10 plants, or 10 parts of plants, of each variety. The mean difference was significant at the 5% probability level based on a paired Student's t-test.

Comparison table for 'Nonpareil Russet' with reference varieties 'Russet Burbank' and 'Maritime Russet'

Plant height (cm)

  'Nonpareil Russet' 'Russet Burbank' 'Maritime Russet'
mean 69.8 62.7 59.5
std. deviation 3.7 2.2 3.8

Click on image for larger view
Nonpareil Russet
Potato: 'CO98067-7RU' (right) with reference varieties 'Russet Burbank' (centre) and 'Maritime Russet' (left)

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