Robertsanswered grow question 4 years ago https://www.gardendesign.com/how-to/powdery-mildew.html#:~:text=Powdery%20mildew%20fungicide%3A%20Use%20sulfur,from%20the%20plant%20and%20discard. Here is a link on how to treat it proper. Spay at beginning of night hours