Determination of Cold Damage in Vineyard and Laboratory Conditions in Dormant Buds of Karaerik Grape Cultivar

This study was conducted to detect cold damage in dormant buds of grapevine under vineyard (by shooting test) and laboratory (by sectioning method) conditions. in the determination of the low temperature damage, it has been investigated whether there is a difference between the method of sectioning in laboratory conditions and the real shooting level in the vineyard conditions. the study was carried out in the vineyard which was established with the karaerik (vitis vinifera l.) grape cultivar in the üzümlü district of erzincan in 2012, 2013 and 2014. samples of one-year-old canes from the vineyard was transported to the laboratory on the same day and sections were taken to determine the damage level. cold damage was assessed based on 1-4 bud averages. in addition, cold damage was evaluated separately in 1^st, 2^nd, 3^rd and 4^th nodes. the mortality rates of primary and secondary buds for the first 1-4 buds average were determined and the vitality rates of tertiary buds were determined in order to determine the ultimate vitality. at the second stage of study, the mortality rates (%) of primary and secondary buds and the viability rates (%) of tertiary buds were determined by counting in spring the shoots come from the primary, secondary, and tertiary buds of the first 4 buds that were left in pruning in vineyard. secondary and tertiary buds were also considered alive if the primary buds have sprouted in vineyard. in the study that determined the level of damage of the buds, it was found that the difference between the sectioning method and the shooting test was 7.9% in primary buds, 14.56% in secondary buds, and 0.1% in tertiary buds. the mortality rates of primary buds and the viability rates of tertiary buds were found statistically insignificant differences between the methods, however the mortality rates of the secondary buds were found statistically significant differences between the methods.