Have you tried the baking soda spray? 1 heaping tablespoon baking soda, 1 tablespoon orange oil or horticultural oil or mineral oil and 1 tablespoon of molasses per gallon of water.To fight the Powdery Mildew on my Dahlias I've been spraying both sides of the leaves with Milk and water at 1 to 2 parts ratio. Is there another home remedy for Powdery Mildew?
I don't know if olive oil will work or not, it may be too thick. Mineral oil or baby oil will though. Molasses can be found in small quantities at the grocery store usually close to where the honey and baking goods are stored. Read about molasses in the Organic Gardening forum on this site. Look for Molasses the Wonder Drug thread.
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