May/June 2021

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Spudman • May/June 2021 35 CULTIVAR CORNER Yukon Gem OVERVIEW Parentage: Brodick x Yukon Gold Developer: Northwest Potato Variety Development Program Plant Variety Protec on: PVP issued in 2007. Strengths: Yukon Gem is a be er-yielding, disease-resistant Yukon Gold type. MORPHOLOGICAL CHARACTERISTICS Plant: Yukon Gem is a mid-season selec on with PVY and late blight resistance. Tubers: Round-oblong, yellow flesh with higher yield poten al than Yukon Gold. Its low to medium tuber set yields an op mal size profile. AGRONOMIC CHARACTERISTICS Maturity: Mid-season maturing. Tubers: Yukon Gem produces round-oblong tubers with a slightly russet-like yellow skin. Tuber yield and size distribu on is be er than Yukon Gold. Yield Poten al: High Specific Gravity: Yukon Gem has a moderately low specific gravity. Culinary Quality: Excellent with tubers exhibi ng no a er-cooking darkening. Diseases/Physiological Disorders: Yukon Gem is resistant to PVY and late blight, as well as tuber malforma on and most internal and external defects. Incen ves for Produc on: Resistance to diseases make Yukon Gem an excellent organic alterna ve for fresh, fry and chip produc on. MANAGEMENT Fer lity: In Idaho, a total of 240 pounds of nitrogen (N) per acre gave the best U.S. No. 1 yield response with a 500 cwt/acre yield. Yukon Gem requires about 10% less nitrogen fer lizer than Russet Burbank per unit of yield produced. Excessive N can lower and quality and prolong matura on. Higher N can also lower specific gravity. Metribuzin resistance for Yukon Gem is good at normal applica on rates. Plan ng: Cut seed to 2.5- to 3-ounce size. Op mal plant spacing for commercial produc on on 36-inch rows inSoutheast Idaho is 8 to 10 inches; 11- to 13-inch seed piece spacing should be used for an increased propor on of large tubers. Plant 5 to 6 inches deep. Storage: Store just as you would Yukon Gold. Seed Produc on and Availability: Check www.pvmi.org for a full list of seed growers.

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