Possible. Sodium in excess? I haven't tried that mix. How much baking soda per gallon? How much oil?
Hi Har,
In one gallon of water I mixed: 2 Tbsp baking soda, 2 Tbsp vegetable oil and just enough eco friendly dish soap to emulsify the oil when the mixture was agitated. Perhaps I used too much baking soda and the excessive amount of sodium burned the leaf tips
Next time I will only use 1 Tbsp baking soda.
Also, next time I was considering using neem oil instead of vegetable oil.
I'm trying everything I can to keep this powdery mildew at bay.
I may try a copper spray eventually, but the toxicity from excess use has me reluctant to do so.