Fungicide Resistance is a real issue in the grape industry in regards to powdery mildew control. Growers need to take this seriously and be able to recognize signs of it in their vineyards; however, sometimes what may appear to be a resistance problem may actually be an issue of poor sprayer calibration/coverage. Watch this brief video with Research Plant Pathologist with the USDA Walt Mahaffee as he explains and read more about it in American Vineyard Magazine. Don’t currently receive the magazine? Subscribe for free at: https://malcolmmedia.com/american-vineyard-subscriptions/