Thanks for the recipe! My squash will get powdery mildew every summer at some point. I'm going to try this recipe. I can readily get KaHCO at my local homebrew supply store. Like anything, I imagine getting things early is key.
Quote:
Originally Posted by RayR
https://attra.ncat.org/attra-pub/download.php?id=126nteaspoosg
I used 4 teaspoons of potassium bicarbonate and 1 teaspoon of liquid dish soap (not detergent) per gallon for powdery mildew on squash and it was effective at killing PM. Experiment and see what works best. I don't particularly like the idea of using sodium bicarbonate because of the potential phytotoxic effects of the sodium ion which can vary between the type of plant. Besides potassium bicarbonate is just more effective.
Potassium bicarbonate is sold by wine making suppliers, Best price I've found was $7.50/LB + shipping on ebay.
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