I have used the green cure with no ill results and that is almost pure potassium bicarbonate. I would imagine you mix it at the same ratio?You can use it, but you'll probably have to dilute it a bunch.
I would recommend Southern Ag Garden Friendly Fungicide. Very cheap, and you just mix 5ml/gallon and use as a foliar spray once a week. Potassium bicarbonate works but if your strength is too weak, it won't be effective and if it's too strong you'll burn your leaves.
Potassium bicarb is a naturally occuring mineral, and is as much an organic component as limestone.
Do you spray neem on flowers too
I use neem on the whole plant once a week up till 4 weeks into bloom. Since the half life of neem is only a couple of days there will be very little left 4 weeks or more later.
It is an "inorganic compound" but that does not mean that it is "not organic". It has uses in cooking and foods, in agriculture for changing soil pH and as a fungicide. It meets the requirements of and is approved for organic farming and gardening.
