What are the Organic Treatments for Killing Powdery Mildew?
When treating your plants, make sure the leaves are coated with the solution. Reapply weekly unless otherwise specified on a products label.
Numerous studies have shown milk and/or whey to be an effective anti-fungicide. The milk and whey are believed to produce free radicals which are toxic to the fungus.
Mix 60 parts water with 40 parts milk or whey and spray onto the affected plants bi-weekly.
Mix one oz powdered milk to 2 liters of water.
Baking soda changes the pH of the fungus and kills it.
Mix 1 tbs of baking soda and 1/2 tsp liquid hand soap with one gallon of water.
Spray solution on affected leaves, and dispose of any remaining solution. Do not apply during daylight hours. It may be best to test one or two leaves to see if the solution will cause the plant to suffer sunburn.
Potassium bicarbonate is a safe, effective fungicide. It is used as a leavening agent, and is used in wines and bottled waters.
Mix 3 tbs potassium bicarbonate, 3 tbs vegetable oil and a half teaspoon soap iinto a gallon of water.
Sulfur is a natural product that is very effective at preventing and controlling powdery mildew. Sulfur can be bought as a dust, or as a liquid which can be added to sulfur vaporizers.
Follow the dosing instructions closely and wear gloves, eye protection, and a face mask. Avoid inhaling or coming into contact with the sulfur .
Neem oil is made from the seeds and fruit of the evergreen neem tree. Neem oil works by disrupting the plants metabolism and stopping spore production.
Mix 3 tbs of neem oil to one gallon of water.
Take precautions to avoid sunburn of leaves, and avoid spraying the plant's buds and flowers.
Copper is a very effective fungicide, but it is very important to follow label directions closely. Too much copper will be detrimental to the plant and the soil.
Powdery mildew on pumpkin leaves,
Powdery mildew on pumpkin leaves, | Source
Vinegar is very acidic. When sprayed on powdery mildew it changes the fungi's pH, effectively killing it.
Mix 4 tbs of vinegar with 1 gallon of water. Reapply every three days.
Garlic has a high sulfur content and is an effective anti-fungicide. Garlic oil can be bought commercially if you do not wish to make the solution at home. Garlic works best when added to organic oil mixtures.
Crush six cloves and add to one ounce of an organic oil such as neem oil and one ounce of rubbing alcohol. Let set for two days, then strain and retain the liquid and crushed garlic. Again soak the garlic, this time in one cup of water for a day. Strain out and dispose of the crushed garlic. Add the oil and alcohol mixture and garlic water to one gallon of water. Spray your plants, coating only the leaves.