Hydrogen peroxide (H2O2) is commonly used to disinfect wounds, disinfect toothbrushes, clear acne, and treat foot fungus. Other household uses for H2O2 are to clean glass surfaces, remove tub scum, control mold and mildew, and disinfect household items (cutting boards, dish sponges, lunch boxes).
In the garden, hydrogen peroxide can be useful in controlling powdery mildew and control fungal disease on plants. Gary Pilarchik, from The Rusted Garden, explains the mechanism in which hydrogen peroxide works, how to use it, and discusses the mechanism of other commercially known products. It is well worth viewing as Gary shares the results of his trials with the use of hydrogen peroxide on his tomato plants.
PS. My cucumber plant started developing powdery mildew on a few of its leaves. I sprayed H2O2 (dilution of 12 tbsp./gal). I was amazed with the results! The powdery mildew came to a screeching halt! The effects of this spray are not lasting; in other words repeated applications are necessary for best results. I encourage you to watch the video as it is extremely informative.
