Determination of Frost Resistance of Sweet Cherry Varieties Using Laboratory Freezing

Abstract

The article presents the study results of the frost resistance of sweet cherry varieties of different ripening periods under artificial freezing. The damage degree of various tissues of one- and two-year-old wood, as well as fruit formations, was analyzed. In the group of early-ripening and late-ripening varieties, a significant resistance of the bark to the effect of low temperature was found, the average damage score was 0.7. Among late-ripening cherry varieties Drogana yellow had low-temperature damage to one-year-old wood, while no negative effect on the wood was observed for the Amazonka variety. The highest overall degree of freezing of one-year wood was observed for the varieties Mliivska yellow and Drogana yellow, the lowest values were obtained for the varieties Meotida, Mirage and Amazonka. Dispersion analysis based on a combination of factors confirmed the highest degree of wood freezing for the Mliivska yellow and Drogana yellow varieties. Among the early-ripening varieties, the two-year-old wood froze the most in trees of the Dar Mlieva variety, where the highest degree of damage to the tissues of the bark, cambium, and wood was observed.