Gabby, you might not be close enough to want to pay shipping for orders, but there's a company in Ohio with a really good online catalogue that explains what products are good for what problems. It's called Ohio Earth Food, in Hartville, near Canton, OH.
(I wish I knew how to post so that links are clickable.)
You will find something for fungus (powdery mildew) on there, and it's likely to be organic.
“The greatest fine art of the future will be the making of a comfortable living on a small piece of land...” - Abraham Lincoln
"Have patience with all things, but chiefly have patience with yourself.
Do not lose courage in considering your own imperfections, but instantly set about remedying them--every day begin the task anew."
- St. Francis de Sales
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