In Radika Kesavan wrote:
Interesting. Whole, reduced fat, skim milk?

Mix it with whole milk, Radika (4% fat). Spray it liberally to run off
point, preferably undersides as well as tops.

I got rid of all spring mildew on my prone roses with 3 sprays, each 1
week apart. I never EVER got that kind of result with Triforine, Lime
Sulphur or Mancozeb. It bowled me over.

By the way, milk is equally good on black spot.

How could something so simple really work? My guess is that rose fungi
just can't deal with the proteins and fats in good old milk.