ITASCA: A Great White Hope · 2017-01-25 · ©Thull 2016. Itasca can grow vigorously. 16. Leaves...
Transcript of ITASCA: A Great White Hope · 2017-01-25 · ©Thull 2016. Itasca can grow vigorously. 16. Leaves...
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ITASCA: A Great White Hope ?
or, The Grape Formally Known As:MN 1285
Drew Horton, Enology SpecialistUniversity of Minnesota
Grape Breeding & Enology Program
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U of MN Cold Climate Fruit Breeding
• Program began in 1906• Breeding of Grapes, Apples, Berries, Trees• Located in Excelsior, MN• About 10,000 vines, 7,000 new seedlings/year• NOT “GMO”, but classic hybridization through
specific cross-pollination and isolation…• Frontenac, La Crescent, Marquette, etc.
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3/30/2016 3©Thull 2016
My! What nice clusters you have!!…
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Itasca (Frontenac Gris X MN 1234)
• Cross made in 2002• Selected in 2009• Harvest mid-
September • Very Hardy• Disease Resistant• No Phylloxera• High Quality Fruit
Chemistry• A great white hope??
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Pedigree of Itasca (MN 1285)
V_riparia_MN89
Plantet
Seibel8216
Seibel6468
Seibel405
Seibel4199
V_riparia_MN39
Cascade
SV14-287
Aramon_du_Gard
Landal
Seibel4595
Veeblanc
Rayon_D'Or
Seibel6905
Seibel5656
MN1095
Villard_blanc
Seyval
Landot4511
MN1234
Frontenac_Gris MN1285
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Origins of the name Itasca• The name of the source-lake for the Mississippi River,
made from combining the Latin words veritas “truth” and caput “head”.
• Native American legend, also, mentions I-tesk-ka, the daughter of Hiawatha, whose tears of anguish at being spirited away to the netherworld reputedly formed the source of the Mississippi. http://www.britannica.com/place/Lake-Itasca
©Thull 2016 63/30/2016
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Itasca, the vine
• Growth habit is open and manageable
• Shoots can grow either upright or procumbent (downward)
• Vines can be vigorous
• Cold-hardiness is excellent
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Itasca, the vine
• Great disease resistance • Fruit exposure is good, can benefit from
minor adjustments• Canes of 10-12 buds perform well after harsh
cold events• Spur pruning also works well• Vine Spacing: 6 feet with ≤2.5 % OM, 8 feet
for ≥3 % OM
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9©Thull 20163/30/2016
Young MN 1285 vine, planted in 2011
Some upright shoots
Pictured in 2015
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Same vine after pruning
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PictureTaken in2015
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The before and after
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Itasca is extremely hardySecondaryBud Alive
Primary Bud Alive
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1/19/2017 ©Thull 2016 13
% Primary bud survival after polar vortex
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Disease resistance is very high
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3/30/2016 ©Thull 2016 15
Itasca’s fruit is easy to expose
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©Thull 20163/30/2016
Itasca can grow vigorously
16
Leaves are Fig-leaf shaped and curl under naturally
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Itasca Mother vine before pruning 2016
©Thull 2016 17
Kicker shoots on the trunk willhelp “de-vigorate” the growth
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Itasca after Pruning 2016
3/30/2016 ©Thull 2016 18Kicker shoots pruned off, back to short spurs
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Itasca the fruit
• The fruit ripens nicely by mid to late September.
• Clusters are cylindrical and often shouldered or winged,structure is moderately compact.
• Berries take on a beautiful golden hue when ripe.
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Itasca the fruit
• Some clusters exhibit a few rosy-colored berries.
• Juice TA chemistry can come in under 10 g/L
• Brix can reach 25%, • pH of 3.05 – 3.35
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Sun-ripened, Golden Fruit of Itasca
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Winged Cluster of Itasca
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Itasca achieves Great Fruit Quality
3/30/2016 ©Thull 20162012 Numbers - Brix: 26.0 pH: 3.35 TA: 9.33
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Juice Chemistry
• Brix: 24.7 - 28.2 • pH: 3.04 - 3.31• TA: 9.5 - 10.8 g/L• 95 - 145 g clusters
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Fruit Quality Traits of MN Cultivars
Genotype °Brix TA (g/L) pH Bud Survival % in 2014
Itasca* 24.7 10.85 3.04 64.6
Frontenac 24.8 15.33 3.07 27.1
Front. Gris 23.7 15.62 2.99 25.0
La Crescent 21.9 14.49 3.00 39.6
Marquette 24.4 12.85 2.99 14.6
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Itasca, the wine & wine making• Aromas and flavors:
Apple, Quince, Melon,Citrus, Pear, Gooseberry,Star fruit & Mineral
Beautiful golden color
Medium bodied
Full-flavored, rich, intense
(Like warm-climate Sauv. Blanc)
• Winemaking:
Whole-cluster pressing
De-stem & Cold-soaking
“Designer” yeasts
Barrel ferment, or partial…
Full MLF or partial
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Itasca is a Grower-Friendly Vine and a Winemaker’s Grape at the Same Time.
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Itasca, a great grape!
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3/30/2016 29©Thull 2016
Itasca – Available in 2017
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Dr. James Luby Peter Hemstad
Acknowledgements
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Acknowledgements
©Thull 2016 31
Dr. Matthew ClarkAssistant Professor
Grape Breeding & Enology Project Leader
3/30/2016
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Nick SmithKatie CookDave HansenPenny AguirreAnne HallThomas Hutton
Acknowledgements
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John & Jenny Thull
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THANKS!
Questions ???
Drew Horton Enology SpecialistUniversity of MinnesotaGrape Breeding & Enology [email protected]