Published in Good Fruit Grower
By Melissa Hansen, Washington State Wine Commission
May 25, 2016
Grape powdery mildew control programs, often requiring six to 10 fungicide applications, used to drag on for most of the growing season. Through research supported by the Washington State Wine Commission, growers have been able to shave off one or more fungicide sprays to save the industry more than $2 million annually.
Grape powdery mildew, a problem worldwide, can render a season’s worth of inputs and efforts into discarded cull fruit. Most Vitis vinifera varieties are susceptible to the disease.
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