A new cold hardiness tool is available just in time for winter for Washington State grape growers through AgWeatherNet, a statewide databank of weather and environmental information.      The new grape cold hardiness computer model represents two decades of work by Washington State University researchers who have annually collected cold hardiness data, making it available to growers. For years, WSU technician Lynn Mills and others would track critical temperatures and damage to 10, 50, and 90 percent of grapevine buds and phloem and xylem tissue, using a programmable freezer and data logger. Grape hardiness acclimation in the fall and […]