How do you use potassium bicarbonate to control powdery mildew?

Question

This post describes using potassium bicarbonate to control powdery mildew, but doesn't give any more info.

So I'm looking for the following:

Efficacy? Mixing rate? Application rate? Application frequency?

And finally, are there different types of potassium bicarbonate and, if so, can they all be used for this purpose?

I don't use bicarb for this, its a hell of a lot easier to use cow's milk - 1 part cow's milk to 9 parts water. — Bamboo, Aug 14 '15 at 13:40

score 2 · Accepted Answer · answered Aug 14 '15 at 20:05

I tried this and it did not work for powdery mildew on lupins or Monarda. Your mileage may vary:

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