If you're using a bigger or smaller bottle, adjust the measurements so you're mixing one part hydrogen peroxide and three parts water. Pour a quart of standard 3 percent-strength hydrogen peroxide--available from most drugstores--into a gallon-sized spray bottle. Joshua Duvauchelle is a certified personal trainer and health journalist, relationships expert and gardening specialist. His articles and advice have appeared in dozens of magazines, including exercise workouts in Shape, relationship guides for Alive and lifestyle tips for Lifehacker. Remove any heavily infested plant foliage and stems that have wilted because of the powdery mildew. Mist the hydrogen peroxide onto your plants, focusing on areas that have powdery mildew growth. That familiar brown bottle in your grocery store, 3% strength hydrogen peroxide, is a good natural treatment for powdery mildew. per gallon. Coat the foliage until there's so much moisture that it beads and drips off of the leaves. ADD THIS AMOUNT OF 3% HYDROGEN PEROXIDE--OR-- ADD THIS AMOUNT OF 35% HYDROGEN PEROXIDE: 1 cup: 1 tablespoon: 1/4 teaspoon: 1 pint: 2 tablespoons: 1/2 teaspoon: 1 quart: 1/4 cup: 1 teaspoon: 1 gallon: 1 cup: 1 tablespoon plus 1 teaspoon: 5 gallons: 5 cups: 6 tablespoons plus 2 teaspoons: 10 gallons: 10 cups: 3/4 cup plus 1 tablespoons plus 1 teaspoons: 20 gallons: 20 cups When trimming infected plant foliage, don't let the pruned stems and leaves touch uninfected plants. Although powdery mildew can be controlled quickly and effectively with commercial garden mildewcides, those interested in natural home remedies can mix their own mildewcide from over-the-counter hydrogen peroxide. I think its suggested at 3% (1 tsp of 35% per gallon water). You can use a mix of hydrogen peroxide and water to control disease. Ratio for a H2O2 bath for powdery mildew is about 1-1.2 oz. Pour a quart of standard 3 percent-strength hydrogen peroxide--available from most drugstores--into a gallon-sized spray bottle. Caused by fungal spores, the mildew can quickly spread from infected plants to the plants beside it. Repeat the hydrogen peroxide application once daily until the powdery mildew problem subsides. Mix it around. Add three quarts of water and shake the spray bottle to mix its contents thoroughly. You put 6-8 oz of hydrogen peroxide in a container and then put in 5 gallons of water roughly. Then, apply it as needed to control any new powdery mildew growth. Best offers for your garden - http://s.click.aliexpress.com/e/1Wy5buU---------------How to Use Hydrogen Peroxide to Kill Powdery Mildew. You can also add hydrogen peroxide to your hydroponic solution. Cut off the foliage with a sharp pair of scissors or garden shears and discard them in a sealed plastic bag. Caused by fungal spores, the mildew can quickly spread from infected plants to the plants beside it. If you're using a bigger or smaller bottle, adjust the measurements so you're mixing one part hydrogen peroxide and three parts water. Although powdery mildew can be controlled quickly and...Table of contents How to Use Hydrogen Peroxide to Kill Powdery MildewThings You'll Need 00:46Tips \u0026 Warnings 01:53Music by HookSounds http://www.hooksounds.com/ How to Use Hydrogen Peroxide to Kill Powdery Mildew - YouTube Apply directly to the soil and mist on leaves for best control. By creating an account you agree to the Hunker. Powdery mildew doesn't just give your plant's foliage a dusty white look; it can stress and kill your plants if it's not controlled. Mix 1 pint of water with 4 to 5 tablespoons of household hydrogen peroxide (3 to 9 percent strength) in a spray bottle. Hydrogen peroxide may take longer to kill powdery mildew than commercial mildewcide chemicals, but it is all-natural and inexpensive. Hydrogen peroxide works by oxidizing the mildew cells and killing them over time. 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