Living in the PNW we deal with mildew , it's especially on my dahlias and roses....I just use straight milk mixed with water spray every two weeks until cleared. Also helps to rid the bugs that hop around and spread the mildew..
Here's another great recipe for milk and others. Listerene kills bugs and disenfects. Slugs hate it...use with insectidal soaps...
https://dengarden.com/gardenin...
Works like a charm..
