Monitor and use the UC Davis powdery mildew risk index model to determine necessary spray intervals and material choice. As always, follow label guidelines for application rates, minimum spray intervals, and pre-harvest intervals. Where powdery mildew control is poor this is usually due to inadequate spray coverage or the interval between sprays being too long rather than reduced fungicide efficacy. Sulfur controls powdery mildew on grapevines under certain growing conditions. According to “The Pacific Northwest Plant Disease Management Handbook,” grape powdery mildew represents “A fungal disease common to all areas of the Pacific Northwest.The disease tends to be more severe on the west side of the Cascade Range but is a chronic problem in arid districts where over-the-canopy irrigation is used for early-season frost protection or … Spraying is important to the survival of your plants. By: Becky Garrison. For a complete background on how to grow grape vines, we recommend starting from the beginning. Spraying Grape Vines. How to Use Sulfur on Grapes. To handle potential diseases and pests, reference the guidelines below to know what you should spray, and when you should use it. Powdery mildew is one of the most common disease issues grape growers face. Downy mildew causes oily, yellowish, reddish or brown spots on the new leaves' upper surfaces, accompanied by white, fluffy spores on … However, with a comprehensive and well-timed management program, your risk of crop loss can be significantly reduced. NOTE: This is part 9 in a series of 11 articles. Powdery mildew surfaces as red blotches on dormant grape vine canes. 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