Published in Good Fruit Grower
By Melissa Hansen, Washington State Wine Commission

April 19, 2016

You walk through your vineyard and see suspicious-looking red leaves. Before you assume the worst—grapevine leafroll or red blotch disease—consider that your vines could have a nutritional imbalance. Dr. Joan Davenport, soil scientist for Washington State University, recently completed nutrient management research funded by the Washington State Wine Commission that resulted in recommendations on how to best apply phosphorus leading to healthy vineyards.

The project is part of Davenport’s overall effort to develop guidelines for nutrient management of irrigated
wine grapes in eastern Washington.

In wine grape cultivars, red leaves can indicate several possible stress disorders.

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Soil Health // Vineyard Nutrition //