Cécile Stelzer Johnson wrote:
Curious George wrote:Anyone have suggestions for companion plants that will help prevent fungal diseases on fruit trees? For example, this year I noticed mildew on my young apple trees.
It is hard to say that a companion plant would help:
You identified the problem as a fungal problem. So there is a *fungus*, airborne or waterborne, that is coming on your trees. Favorable conditions, such as high humidity, wet weather, and leaf wetness, promote spore germination and infection.
You might want to look at your watering schedule or at what's on the ground: Fungi overwinter in debris on the orchard floor, in infected twigs, cankers, or mummified fruits, serving as a source for new spring infections. I don't spray much but I religiously clear the floor of any damaged fruit during the season.
"Dr. Google" recommends a couple of home made sprays to remove more specifically the mildew from fruit trees:
"Baking Soda Spray:
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Mix 1 tablespoon of baking soda with 1 teaspoon of liquid dish soap and 1 gallon of water. Spray on affected areas and repeat as needed. The baking soda helps alkalize the leaf surface, stopping the fungus.
Milk Spray:
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A mixture of 40% milk and 60% water can both treat and prevent powdery mildew.
Vinegar Spray:
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Mix 4 tablespoons of vinegar with 1 gallon of water. The acetic acid in vinegar kills the fungus."
So it seems that messing with the PH of the fungus helps to kill it, too.