‘Itasca’ is a new grape cultivar for winemaking, which has been bred for use in cold climates due to its ability to survive and produce high-quality fruit in USDA hardiness zone 4 (average minimum −37.2 to −34.4 °C). The vines have demonstrated improved winterhardiness compared with other cold climate cultivars such as Marquette, La Crescent, and the Frontenac series. ‘Itasca’ exhibits disease and insect resistance, which may make it a candidate for reduced spray programs using integrated pest management or organic approaches. At harvest, Itasca fruit has improved juice chemistry compared with the previously listed cultivars, making it more suitable for wine production specifically a reduction in total titratable acidity (TTA) compared with other cold-hardy, white wine cultivars Frontenac gris and La Crescent. ‘Itasca’ has more sugar at harvest than ‘Brianna’, another cold-hardy variety with low total acidity levels.
Bely, M.B., Sablayrolles, J.-M. & Barre, P. 1990 Automatic detection of assimilable nitrogen deficiencies during alcoholic fermentation in oenological conditions J. Fermentation and Biogengineering. 70 4 246 252
Butzke, C.E. 1998 Survey of yeast assimilable nitrogen status in musts from California, Oregon, and Washington Amer. J. Enol. Viticult. 49 220 224
Hagen, K.M., Keller, M. & Edwards, C.G. 2008 Survey of biotin, pantothenic acid, and assimilable nitrogen in wine grapes from the Pacific Northwest Amer. J. Enol. Viticult. 59 432 436
Luby, J. & Hemstad, P. 2003 Grape plant named ‘Frontenac gris’. USPP16478
Teh, S.L., Fresnedo-Ramírez, J., Clark, M.D., Gadoury, D.M., Sun, Q., Cadle-Davidson, L. & Luby, J. 2017 Genetic dissection of powdery mildew resistance in interspecific half-sib grapevine families using SNP-based maps. Mol. Breeding. 37:1