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WebAug 22, 2006 · Powdery mildew on the clusters is best controlled by maintaining an open canopy and applying effective fungicides during the critical period (immediate pre-bloom until three to four weeks after bloom), which has now passed. WebPowdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales . Powdery mildew is one of the … Webpowdery mildew. Early detection is important for a successful disease control. Follow season-long monitoring for powdery mildew starting as soon as new plants are placed in … how much warmer is an insulated garage