Spray your zucchini plants once a week with a solution of 1 part milk to 9 parts water. You can use any kind of milk available. This will keep your plants from getting powdery mildew, a serious threat to zucchini plants. | eHow
"If you are seeing powdery-looking patches on the foliage of your plants, you most likely have a case of the very common powdery mildew fungal disease. Here is a simple spray for controlling the spread of the fungus. It won't get rid of the fungus on leaves that already have it, but it will prevent it from spreading to the rest of the plant." Farming & Agriculture
Powdery mildew natural fungicide Combine: 1 teaspoon baking soda 1 quart water A few drops of liquid soap Combine in a large container and transfer some to a spray bottle. Spray the leaves of plants where powdery mildew can be seen, then repeat a week later. For best results, treat plants as soon as you notice the powdery mildew.
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aspirin for your plants - Aspirin is the remedy for fungal plant problems, Black spot, powdery mildew, and rust are a terrible trio of fungi, which can attack and destroy your plants. Scientists have found that two uncoated aspirin tablets (325 milligrams each) dissolved in 1 quart of water and used as a foliar spray can thwart these diseases... 35 Pest, Disease and Weed Remedies--green and safe