Always spray the tops and bottoms of the leaves as well as the stems. I dilute 3% hydrogen peroxide down to 12 Tablespoons or 6 Ounces of H2O2 per gallon of water. There is a lot of information on mix ratios and some of them are straight up wrong. You can find that in your pharmacies and grocery stores. I use 3% hydrogen peroxide for creating my garden spray. If H2O2 is not diluted in water, the above process will also damage the plant's leaves as well as kill the targeted bacteria or fungus. You can't spray Hydrogen Peroxide directly onto your vegetable plant leaves unless it is extremely diluted. The chemical reaction or process that changes H2O2 (Hydrogen Peroxide) to H2O (water) and O (oxygen) kills the contacted fungi. The bond between the two hydrogen peroxide oxygen atoms change, electrons move and energy is released.This process is called oxidation. When we spray H2O2 onto tomato leaves, the fungi like 'Leaf Spot' and 'Early Blight' or contacted and covered. The bonds that form a molecule of hydrogen peroxide are very unstable. This an extremely simplified explanation of how Hydrogen Peroxide or H2O2 works to kill fungi and bacteria on your tomato plants. You can keyword search: The Oxidative Burst in Plant Disease Resistance for detailed information. Studies have shown that plants create H2O2 and similar molecules in response to fungal and bacterial attacks. It has one more oxygen atom than water, which is H2O. Hydrogen Peroxide is H2O2, two hydrogen atoms and 2 oxygen atoms bonded together.
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