there are other preparations available in the garden sections of nurseries and chain stores that sell plant herbicide/fungicides, etc. but try this .. if it works -- Great -- if not move to the 'big guns' ... and in maintaining your plants, good air circulation is beneficial , don't 'crowd' them -- but some plants -- roses, zinnias, Phlox, etc are particularly susceptible to Powdery Mildew --
I had that with some of my hydrangeas one year. Landscaper recommended something that I needed to buy at garden center (apologies for not remembering name). However, I do remember having to be extra careful and vigilant about treating and avoiding spreading it via my tools. Good luck!
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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actually MILK sprayed on the plants so affected works quite well!
https://www.thespruce.com/how-to-use-milk-to-control-mildew-1402739
I had that with some of my hydrangeas one year. Landscaper recommended something that I needed to buy at garden center (apologies for not remembering name). However, I do remember having to be extra careful and vigilant about treating and avoiding spreading it via my tools. Good luck!