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Maritime Russet


Denomination: 'Maritime Russet'
Previously Proposed Denomination: 'CO97087-2RU'
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: 18-9583
Grant of Rights Date: 2020-08-17
Certificate Number: 6245
Grant of Rights Termination Date: 2040-08-17

Variety Description

Varieties used for comparison: 'Russet Burbank' and 'CO98067-7RU'

Summary: The lightsprout of 'Maritime Russet' is ovoid whereas it is spherical for 'Russet Burbank' and broad cylindrical in shape for 'CO98067-7RU'. 'Maritime Russet' has a medium sized lightsprout and in relation to the base, a small tip whereas 'Russet Burbank' has a small lightsprout with a large tip in relation to the base. The intensity of anthocyanin colouration at the base of the lightsprout of 'Maritime Russet' is weak whereas it is of medium intensity for 'CO98067-7RU'. 'Maritime Russet' has a large leaf outline whereas it is medium sized for 'Russet Burbank'. The extent of anthocyanin colouration on the flower bud of 'Maritime Russet' is absent or very low whereas it is low for the reference varieties. The plants of 'Maritime Russet' are shorter than those of the reference varieties. The frequency of inflorescence per plant is medium for 'Maritime Russet' whereas it is low for 'Russet Burbank'. The inflorescence of 'Maritime Russet' is medium sized whereas it is small for 'Russet Burbank'. The eyes on the tuber of 'Maritime Russet' are of medium depth whereas they are deep on 'CO98067-7RU' and shallow on 'Russet Burbank'. The tuber flesh of 'Maritime Russet' is white whereas it is cream coloured for the reference varieties.


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

PLANT: foliage structure is intermediate type where foliage is half-open and stems are partly visible, upright to semi-upright growth habit, matures late

STEM: absent or very low extent of anthocyanin colouration

LEAF: large outline, intermediate openness, medium presence of secondary leaflets, 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 size, leaflet is narrower than long
LEAFLET: weak to medium waviness of margin, shallow to medium depth veins, dull to medium glossiness on upper side, glabrous blade at apical rosette

PEDUNCLE: absent or very low extent of anthocyanin colouration
INFLORESCENCE: medium frequency per plant, medium size
FLOWER BUD: absent or very 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, white flesh
TUBER EYE: medium depth, yellow at base
TUBER SKIN: reddish brown

Origin & Breeding History: 'Maritime Russet' (experimental designation CO97087-2RU) originated from a cross between 'CO87009-4', as the female parent and 'W1005', as the male parent, conducted at the Colorado State University San Luis Valley Research Center, in Center, Colorado, USA in 1997. In 1998, the true potato seed resulting from the cross was sown in a greenhouse and the resulting seedling tubers field planted in Center, Colorado. One of the progeny designated as CO97087-2RU was identified in 1999. Selection criteria was based on negative mass selection for agronomic characteristics and disease resistance.

Tests & Trials: The comparative trial for 'Maritime Russet' 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 'Maritime Russet' with reference varieties 'Russet Burbank' and 'CO98067-7RU'

Plant height (cm)

  'Maritime Russet' 'Russet Burbank' 'CO98067-7RU'
mean 59.5 62.7 69.8
std. deviation 3.8 2.2 3.7

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

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