Attached is a brief outlining ‘How to assess winter bud damage’.
It also provides some tips on pruning in response to winter damage.Winter temperatures in the hills surrounding Kelowna and areas to the north dipped below -27 °C over the Christmas holidays.
Average bud hardiness (LTE50 – the ambient temperature at which 50% bud kill can occur) for Vitis vinifera at that time ranged between -23 °C to -25 °C. Widespread winter bud and vine damage is unfortunately to be expected.
Prepared by Carl Bogdanoff
Agriculture and Agri-Food Canada,
Summerland Research & Development Center Wine Grape Research