And that will stop fungi spores from forming. Hence, it will help in fighting the powdery mildew … Baking soda ( sodium bicarbonate ) is an antifungal agent and can even kill some established forms of fungus . Recent studies confuse the … Best of all, baking soda … Well, the baking soda will increase the pH levels on the leaf surface. The milk will decrease the fungi by 90%, also boosting the plant’s immune system. Baking soda, or sodium bicarbonate, has been touted as an effective and safe fungicide on the treatment of powdery mildew and several other fungal diseases. Before we get into the recipe, it’s important to mention that this remedy is best used as a preventative measure rather than a full treatment. Does baking soda kill fungus? Russian plant pathologist A. de Yaczenski showed successful results using a simple mixture of baking soda … Keep reading and see my own DIY baking soda spray that will make things better. Research has shown it’s effective against some kinds of black spot and powdery mildew . Howard Garrett—a well-known horticultural columnist and radio personality in Dallas, Texas, recommends baking soda sprays at a concentration of 4 teaspoons (1.3 tablespoons) per gallon of water for control of powdery mildew… The first recorded use of baking soda for treatment of powdery mildew on roses dates back to 1933. Thus, if you don’t want to use fungicides for your powdery mildew, you should consider a simple remedy.