Maximum frost resistance and resistance to return frosts of highbush blueberry cultivars introduced in Belarus
Abstract
Extreme frosts observed in Belarus in some winters cause freezing of the vegetative and generative blueberry sphere. The maximum frost resistance of blueberry depends mainly on the cooling rate, i.e. the slower the ambient temperature decreases, the higher the resistance is. Most introduced cultivars of blueberry keep the temperature lowering to -30 °C. Thaws observed annually in Belarus reduce frost resistance of blueberry generative sphere. Return frost damages periodically awakened flower buds. During a sharp drop in air temperature, the generative buds freeze, this ultimately leads to a decrease in productivity of blueberry, especially at low reproductive cultivars. With a gradual increase of frost the blueberry generative sphere hardens again and develops genetically determined frost resistance for each cultivar. In the climatic conditions of Belarus the higher frost resistance of the second and fourth components is observed at early- and mid-ripening blueberry cultivars.
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Review
For citations:
Pavlovski N.B. Maximum frost resistance and resistance to return frosts of highbush blueberry cultivars introduced in Belarus. Fruit Growing. 2014;26(1):256-270. (In Russ.)
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