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Old June 19, 2015   #17
Join Date: Jun 2008
Location: Eastern Massachusetts, Zone 6a
Posts: 50

Originally Posted by Itoero View Post

But with potassium bicarbonate I should have better results?
Is there any known difference between potassium and sodium bicarbonate as fungicide?
Yes. There is a good body of scientific research supporting greater efficacy of potassium bicarbonate vs. sodium bicarbonate as a horticultural fungicide. The information is commonly published by reputable academic extension agencies, such as in this PDF link:

As others have mentioned, neither bicarbonate is effective unless mixed with a surfactant (spreader sticker). I'm currently using GreenCure, a commercially premixed potassium bicarbonate product, for the sake of convenience.
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