Polares is a new blackcurrant (Ribes nigrum L.) cultivar released from the Ribes breeding program conducted for many years at the Research Institute of Pomology and Floriculture (now the Research Institute of Horticulture) in Skierniewice, central Poland (Pluta et al., 2000; Pluta and Żurawicz, 1993, 2009). Bushes of ‘Polares’ have a low-plant vigor, upright plant habit, and are moderately productive. They have low susceptibility to economically important leaf diseases and are resistant to the blackcurrant gall mite (Cecidophyopsis ribis Westw.). Gall mite (not found yet in the United States) is the most serious pest of blackcurrant, especially in Europe and New Zealand, devastating its flower and leaf buds and spreading the Blackcurrant reversion virus (Brennan et al., 2008). ‘Polares’ is resistant to the powdery mildew (American gooseberry mildew) (Sphaerotheca mors-uvae Schwein./Berk. et Curt.), moderately susceptible to anthracnose (Drepanopeziza ribis Kleb.) and slightly susceptible to white pine blister rust (Cronartium ribicola Fish.). Fruit of ‘Polares’ are rather small, with a medium level of soluble solids and acidity, and are very rich in anthocyanins and ascorbic acid. ‘Polares’ is a late-season cultivar, which requires fertile soils for successful fruit production. Fruit of ‘Polares’ can be easily collected by different types of harvesters.
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