Baking Soda Fungicide

Question

I am a beginning harder; I sprayed all my plants with a baking soda, oil and dish soap solution. It appears to have harmed my broccoli, cabbage and spinach. There appeared white spots, Which I thought was residue, on the foliage. Should I be concerned? The tomato plant, which had signs of early blight, did not respond this way.

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Answer 1

Some solutions leave residue but your picture was taken too far away from the plants and was not clear. I am not a vegetable gardener but baking soda solutions may add sodium (the harmful component of salt) and reduce B1 vitamins. I think it was once used to maintain color in some vegetables. Now it is used to combat powdery mildew (a PM alternative: you can use 40% milk + 60% water spray solution instead).