The greatest drop in crop yields comes from cold injury or damage to grapevines – more than by any insect or disease, explained Ohio State University’s Horticulture & Crop Science Associate Professor, Dr. Imed Dami at the Eastern Viticulture Workshop held in Mystic, CT.
Grapevines’ level of cold tolerance varies with age, the time of year and based on their age and the pattern of (warm) temperatures preceding the cold period. During the cooler winter months, northern grapevines that have gone dormant slowly are generally very tolerant of cold temperatures.
Temperatures below 32 degrees F can cause injury to plants that have not been slowly cooled. Temperatures below 20 degrees F will probably cause cluster and shoot damage and reduce yields the next season. [Learn more.]