GemStar Russet

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Leaf Flowers Plant
Sprout Tuber Sliced tuber

General

  • Origin & Breeding: bred from the cross (Gem Russet x A8341-5) made in 1990, in Aberdeen, Idaho. Selected by the United States Department of Agriculture - Agricultural Research Service (USDA-ARS) and the Agricultural Experiment Stations of Idaho, Oregon and Washington. Released in 2004.
  • Year registered in Canada: 2010
  • Registration number: 6744
  • Maturity: late

Botanical Features

  • Plants: medium sized, semi-erect; stems lightly pigmented; weakly prominent wings; nodes not or very slightly swollen.
  • Leaves: dark yellowish green, glossy; semi-open; midribs and petioles not or very weakly pigmented; shallow to medium deep veins.
    Terminal leaflets: broadly ovate; tip acuminate; base obtuse; slightly to medium wavy margins.
    Primary leaflets: two to five pairs; large; medium ovate; tip acuminate; base cordate; slightly to medium wavy margins.
  • Flowers: numerous, white corolla with prominent star; yellowish orange anthers; flower buds not pigmented.
  • Tubers: oblong; russetted brown skin, yellow at the base of eyes; shallow to moderately deep eyes, predominantly apical; slightly prominent eyebrows; white flesh.
  • Sprouts: conical; red-violet; base moderately pubescent, moderately pigmented; tip moderately pubescent, not pigmented, semi-open habit.

Agricultural Features

High yielding variety; tubers of attractive appearance; good resistance to second growth, growth cracks and stem-end discolouration; moderate resistance to blackspot and shatter bruising; highly susceptible to hollow heart in late harvest. To reduce hollow heart occurrence, use close in-row spacing such as 20-25 cm. Good resistance to cold sweetening; good french fry color. Medium-long dormancy period. High specific gravity.

  • Utilization: very good for baking and frying.
  • Chief Markets: fresh market, french fry processing and dehydrated products.

Reaction to Diseases

Highly resistant: common scab, powdery scab, PVX.
Moderately resistant: verticillium wilt (V. dahliae), Erwinia soft rot, tuber net necrosis, corky ringspot.
Susceptible: late blight, fusarium dry rot, rhizoctonia.
Highly susceptible: PVY, leaf roll.

References: 1, 8.

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