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Lucretia –
The white mold on plant leaves that you described sure sounds like Powdery Mildew. It’s the most common and widespread of fungal diseases attacking all kinds of different trees, ornamentals and vegetable plants. Common symptoms include patchy, gray, talcum-like dust that covers both the leaves and stems. Fortunately there are several organic are natural controls that work on powdery mildew. Here’s a link that should help.
https://www.planetnatural.com/pest-problem-solver/plant-disease/powdery-mildew/
Happy growing!
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