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It's been so hot, humid and rainy here that I've had an awful time this year with fungus on sage. Someone told me today to spray plants with baking soda mixed with water. I like the idea since it's editable. Anyone tried this? I'm going to spray tomorrow (if it doesn't rain :rolleyes: )
 

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The recipe I use is:

1 quart water
1 teaspoon baking soda
1-2 drops dish soap

Spray every 3 days for a problem, and once a week as a preventative. The baking soda changes the pH of the leaf surface making it less hospitable to the fungi, and the dish soap lessens the surface tension of the water so it will stick better and not bead up and run off so much (so don't use more).

I use this for powdery mildew on almost everything, and black spot on roses.
 
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