One of the most popular powdery mildew solutions is to use baking soda (sodium bicarbonate) diluted in water as a foliar spray on plants. In a 2009 study by the University of Connecticut, which tested a milk treatment of 40% milk and 60% water on plants infected with powdery mildew, "the milk treatment provided significantly less disease than the untreated control, and the chemical treatment had equal or significantly less disease than the milk." Baking Soda works by creating an alkaline environment on the leaf, and fungus (powdery mildew and blight are both fungi) cannot colonize the surface of the leaf since they need a neutral pH (around 7.0) to survive and thrive. This may sound like a surprising solution, but milk is an extremely effective powdery mildew treatment. via Couleur/pixabay.com. Spray leaves with 1 tablespoon baking soda and ½ … Spray solution on your infected leaves. Check the next day, then spray twice on second day,wait one day if still around repeat . This is an example of how and why myths get started. Baking soda works to change the surface pH of the leaf to inhibit powdery mildew growth. Apple Cider Vinegar: 2-3 teaspoons per gallon of water. Thoroughly coat leaves, branches and stalk until they are dripping. How do I prevent powdery mildew on plants? Although this may have limited benefit, studies have shown sodium bicarbonate to be less effective than potassium bicarbonate. Spray solution on your leaves and buds. Powdery mildew and black spot are common garden diseases and one of the most common home remedies is a mixture known as the ‘Cornell Formula’, a mixture whose main ingredient is baking soda. One treatment you probably already have in your kitchen is baking soda. Mix one tablespoon per quart of water and apply with a spray bottle. Repeat every 7-10 days as needed or as a preventative … A 2009 study by the University of Connecticut concluded that milk is just as effective than chemical applications (if not moreso) when it comes to treating powdery mildew. Baking soda: one teaspoon per gallon of water. How to treat it: There are many ways to treat White Powdery Mildew but most gardeners prefer natural and organic methods. Check the next day, then spray twice on second day,wait one day if still around repeat. The common advice is to dilute milk at a ratio of 1:10 with water and spray it on your plants at the first sign of infection. Powdered or liquid milk may be used. Mix 1 part milk to 3-5 parts water and spray on stems and leaves. Milk has shown to help … Combine one tablespoon baking soda and one-half teaspoon of liquid, non-detergent soap with one gallon of water, and spray the … Treatment with milk was most effective at the early stages of infection. Baking soda itself isn’t normally effective as a powdery mildew treatment, but when it’s combined with liquid soap and water, it can be a powerful weapon.  Milk. However, according to the available research to date, higher concentrations of milk may prove to be the most effective.