Umatilla Russet (AO82611-7)

Parentage – Butte x A77268-4^1,3

Breeder – Bred by Dr. J. J. Pavek at the University of Idaho Research Center^1,2. Jointly released by the Agricultural Experiment Stations of Oregon, Washington, Idaho, and the ARS/USDA in 1998^1,2,4

Maturity – Medium to late season^3,4

Usage – Excellent for frozen French fry processing^1,2,4; acceptable for boiling and baking^1,2

Plant – Semi-erect, compact, medium sized plant; weak pigmentation^1,3

Leaves – Dark green, mostly open leaves with weakly pigmented midribs and petioles^1,3; terminal leaflets are ovate with pointed tips and bluntly rounded bases; five pairs of narrow ovate primary leaflets; number of secondary leaflets varies and few tertiary leaflets observed¹

Flowers – Few; lavender (sometimes light violet) on inner surface and blue-violet on outer surface with yellow-orange anthers; low berry production¹

Tubers – Long, oblong, russeted, tan tubers with tapered apical ends; white flesh^1,3; evenly distributed shallow eyes with non-prominent eyebrows¹; marketable yield is slightly more than Russet Burbank^1,4; short dormancy period¹

Strengths – Some resistant to late blight and common scab^1,3; moderately resistant to potato virus Y (visual symptoms not always expressed) and Verticillium wilt^1,3,4; resistant to potato virus X^1,4; less susceptible to hollow heart, brown center, growth cracks and sugar ends than Russet Burbank¹

Weaknesses – Susceptible to early blight, soft rot, dry rot, potato leaf roll virus, and late blight^1,3; more susceptible to blackspot and shatter bruise than Russet Burbank¹

Pictures^1,2

References: ¹Mosley, A. R. et al. 2000. Umatilla Russet: A full season long Russet for processing and fresh market use. American Journal of Potato Research 77: 83-87. ²The Idaho Potato Commission 2022. ³Canadia Food Inspection Agency-Potato Varieties. ⁴Potato Variety Management Institute.   

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Last Revised: 8/29/22

© 2017 The Board of Regents of the University of Wisconsin System