Dr. Joan Davenport holds a Concord leaf during a summer field day to emphasize the importance of using whole leaves for nutrient analysis instead of leaf petioles. A new juice-grape variety under trial has colored well under the hot growing conditions of eastern Washington State, though yields have been disappointing, reported Washington State University’s Dr. Markus Keller at a summer field day held at WSU’s Roza Research vineyard in Prosser. The field day also highlighted research about optimum vine spacing and nutrition for juice grapes. Sunbelt, a juice variety developed by the University of Arkansas that was commercially released in […]