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Clearwater Russet


Denomination: 'Clearwater Russet'
Botanical Name: Solanum tuberosum
Applicant/Holder: University of Idaho
Office of Technology Transfer
875 Perimeter Drive, MS3003
Moscow, Idaho
United States of America
Breeder: Jeffrey C. Stark, University of Idaho, Idaho Falls, United States of America
Agent in Canada: Global Agri Services Inc.
376 New Maryland Highway
New Maryland, New Brunswick
E3C 1E5
Tel: 506-462-9493
Application Date: 2009-03-18
Application Number: 09-6558
Protective direction granted: 2009-03-18
Grant of Rights Date: 2012-03-01
Certificate Number: 4294
Grant of Rights Termination Date: 2030-03-01

Variety Description

Variety used for comparison: 'Ranger Russet'

Summary: The plants of 'Clearwater Russet' are shorter than the plants of 'Ranger Russet'. The midrib on the upper side of the leaf blade of 'Clearwater Russet' has a medium extent of anthocyanin colouration while it is absent or very low for 'Ranger Russet'. The light sprout of 'Clearwater Russet' is ovoid in shape while the light sprout of 'Ranger Russet' is conical. The base of the light sprout of 'Clearwater Russet' has medium anthocyanin colouration while the base of the light sprout of 'Ranger Russet' has weak anthocyanin.


PLANT: upright growth habit, intermediate type foliage structure, mid-season maturity

STEM: absent or very low extent of anthocyanin colouration

LEAVES: small, open silhouette, weak to medium presence of secondary leaflets, light green, medium extent of anthocyanin colouration on midrib of upper side, weak intensity of anthocyanin colouration on midrib of upper side, absent or very low frequency of coalescence of terminal and lateral leaflets
SECOND PAIR OF LATERAL LEAFLETS: small to medium size, narrower than long width in relation to length
LEAFLETS: absent to very weak waviness of margin, shallow to medium depth veins, medium glossiness on upper side, no pubescence on blade at apical rosette

INFLORESCENCE: low to medium frequency of inflorescences per plant, small, absent or very low extent of anthocyanin colouration on peduncle
FLOWER BUD: medium extent of anthocyanin colouration
COROLLA: large, medium anthocyanin colouration on inner side with absent or low proportion of blue, high extent of anthocyanin on inner side

TUBER: long shape, white flesh
TUBER EYES: shallow
TUBER SKIN: reddish brown, yellow at base of eye

LIGHT SPROUT: medium size, ovoid shape, few root tips, short lateral shoots
LIGHT SPROUT BASE: medium anthocyanin colouration, absent or low proportion of blue in anthocyanin colouration, sparse pubescence
LIGHT SPROUT TIP: medium in size in relation to base, closed habit, weak anthocyanin colouration, medium density of pubescence.

Origin & Breeding History: The variety 'Clearwater Russet' originated from a cross between 'Bannock Russet' and A89152-4, made in Aberdeen, Idaho, USA in 1995. The variety was selected in the field as a seedling in 1996 at Aberdeen, Idaho. A phenotypic recurrent selection technique was utilized in its development. The variety was evaluated for 12 years in public and industry trials throughout the western United States. Selection criteria included maturity, yield, disease resistance, processing traits, morphological traits and storage characteristics.

Tests & Trials: Trials for 'Clearwater Russet' were conducted during the summer of 2010 in Drummond, New Brunswick. Plots consisted of one row with a row length of 18.5 meters and a row spacing of 90 cm. Plants were spaced 30 cm apart within the row. There were 60 plants per variety in the trial. Measured characteristics were based on ten measurements.

Comparison table for 'Clearwater Russet' with reference variety 'Ranger Russet'

Plant height (cm)

  'Clearwater Russet' 'Ranger Russet'
mean 49 58
std. deviation 4.0 2.1

Click on image for larger view
Clearwater Russet
Potato: 'Clearwater Russet' (right) with reference variety 'Ranger Russet' (left)