I need a nice cheap recipe for a homemade fungicide. This will be for my squash, tomatoes and rose bushes. I need a lot of it because I have a tone of roses. I've heard 1tsp baking soda/qt along with a few drops of dish soap to help the solution stick. I've also heard of garlic as an ingredient. My squash always gets the powdery mildew and my roses are constantly infected with Blackspot. Anyone have experience with this?
Thank you!
Thank you!