2019/2020 Nova Scotia Wine Grape Bud Hardiness Report no. 2: November 25 - 27
2019/2020 Nova Scotia Wine Grape Bud Hardiness Report no. 2: November 25 – 27
A wine grape bud hardiness report is generated and distributed to the Grape Growers of Nova Scotia (GGANS) membership on a bi-weekly basis throughout the dormant season. The bi-weekly survey is performed on 3 vinifera cultivars (‘Chardonnay’, ‘Riesling’, ‘Pinot Noir’) and 2 hybrid cultivars (‘L’Acadie Blanc’, ‘Marquette’) and involves 10 grower collaborators for a total of 23 varietal blocks in total. Each report uses a table to show the latest low temperature exotherm (LTE) levels for the present and past weeks. The report also includes comments highlighting observations over the last reporting period, a plot showing the change in LTE values throughout the season, the historical 100 year minimum values and the present year’s minimum values. Three times throughout the season (early, middle, late) 11 “extra” varieties (‘Baco Noir’, ‘Chenin Blanc’, ‘Geisenheim’, ‘Leon Millot’, ‘Lucie Kuhlman’, ‘New York Muscat’, ‘Pinot Gris’, ‘Sauvignon Blanc’, ‘Seyval Blanc’, ‘Seyval Blanc’, ‘Vidal Blanc’, ‘Ortega’) from 22 additional varietal blocks are also reported. Bud hardiness values have dropped to within 1 °C of their 2018 values and are 2 to 3 °C lower than they were two weeks ago. This is a welcome finding given that we are beginning to experience winter weather. The 14 day forecast predicts more stormy weather with cycling temperatures, similar to the pattern that we experienced last year. Our most recent survey also included extra varieties that we will sample two more times this winter. This data shows that even some of our more tender varieties, such as Chenin Blanc and Sauvignon Blanc, have a margin of safety relative to current temperatures.