This are leaves from my pumpkin vine. As you can see I have white spots or powdery mildew growing on them. In the past I thought this was just due to me watering the leaves (I don't water the leaves anymore either) but after doing some research I've learned its powdery mildew. This happens on lots of different plants. It's usually due to more than one condition happening. It happens in shady areas, over watered areas, and areas of poor air circulation.
There are many ways to combat powdery mildew. One of which is to use a fungicide. They make both chemical and organic versions. I am currently using an organic Copper fungicide. It's mainly a soapy solution. You spray on the leaves to combat the disease. If left unchecked PM will make your leaves turn yellow and gray and they will eventually die. It does also hinder plant growth. Last year I didn't know much about PM and it basically killed off my pumpkins. The pumpkins themselves survived but the vine wasn't much for PM. I salvaged four decent sized pumpkins somehow. Don't let this happen to your plants. Ask your local garden supply for the right weapon against PM.
I've already noticed a difference to the leaves I've treated with fungicide and they seem to be recovering. If caught early enough they do make a come back. Other plants I've noticed developing PM include squash and zucchini.
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