Determination of Affect Status of Alphonse Lavallée, Cardinal and Hamburg Muscat Grape Varieties from Late Spring Frost Damage

Abstract

In this study, it was aimed to determine the frost damage status of Alphonse Lavallee, Cardinal and Hamburg Muscat varieties after the late spring frost event in Bilecik occurred in 2015. During the growing period of the vineyards, the temperature dropped to -2,8^oC in the frost event that occurred on the night of April 23-24. After 48 hours from the frost damage, observations and counts were made to determine the frost damage. Then, after 4 weeks, observations and counts were made again, and the number of buds left on the vine, the number of awakened buds, the number of buds damaged by frost, and the number and rates of reawakened buds were determined. In the study, it was determined that 82.83% of the buds left in the Hamburg Musket variety awakened on the date of the frost event and 95.93% of them were damaged by frost. It was stated that 66.97% of the buds left in the Cardinal variety awakened on the date of the frost event and 91.15% of them were damaged by frost. For the Alphonse Lavallée variety, the awakening rate in the buds was 69.45%, while 94.01% of these eyes were damaged by frost. With the study, the reawakening rates of the damaged buds and the number of clusters in these buds were also determined.