Yukon Gem / NDA5507-3Y (PDF)
Yellow flesh with better yields
Released in 2006, this round-oblong, yellow-fleshed variety is very similar to its parent, Yukon Gold. However, Yukon Gem (NDA5507-3Y) is higher-yielding (12% higher in Idaho) than Yukon Gold and is resistant to PVY, common scab, tuber blight (early and late), net necrosis, blackspot and shatter bruise. It is moderately resistant to dry rot and foliar late blight. Its resistances make it a good candidate for organic production. It also makes acceptable chips, but its lower specific gravity may limit its use for this purpose.
Yukon Gem is a mid-season selection with light-yellow flesh and higher yield potential than Yukon Gold (its paternal parent). It is also notable for its PVY and tuber blight resistances that are derived from its Scottish parent, Brodick. Yukon Gem total yield across all Western regional sites was significantly greater than Yukon Gold in repeated trials. Merit ratings for fresh pack characteristics including post harvest evaluations for boiling, baking, and microwave characteristics were comparable to those for Yukon Gold in all four years. Yukon Gem has moderately low specific gravity and good resistance to tuber malformations and most internal and external defects; its tubers exhibit little or no after-cooking darkening. It produces acceptable potato chips, but its lower specific gravity may limit its use for this purpose.
Yukon Gem has an erect, medium
vine that matures relatively early in the season. It produces medium
red-purple flowers that have a tendency to abort. It produces round
to oval, light yellow skin with pink splash around the eyes. The
eyes are intermediate in depth and number and are evenly
distributed. Tuber set is low to medium, and tuber size is medium.
Yukon Gem produced higher average
total yields than Yukon Gold in early harvest trials in eastern
Idaho, Oregon, and Washington. Average yields were 12% higher than
Yukon Gold in Idaho, 41% higher in Oregon and 21% higher in
Washington. Yukon Gem produced
higher yields of 4-10 oz. Tubers at all locations but also produced
lower yields of>10 oz. Tubers than Yukon Gold at all locations. In
20 trials grown in Idaho, Oregon, and Washington, average specific
gravity and percent solids for Yukon Gem
were lower than that of Yukon Gold.
Yukon Gem also produced slightly lighter fry color than
Yukon Gold out of 45°F storage.
Agronomy Notes for Yukon Gem (PDF) (Revised March 16, 2010)
University of Idaho Cultural Management Recommendations for Yukon Gem (PDF)