Fungicides are not that difficult to come up with yourself. Bleach and peroxide can work. There are other ideas like a milk spray, which I believe changes the ph on the leaf surface.
Pesticides are much harder to find in a form that is not toxic to humans. Pyrethrins get organic approval, but are still dangerous to ag workers. I know the spray stings when the wind blows it back at me.
For people worried about chemicals sprayed on your food, you don't want to touch flowers. Non food crops are approved for the most toxic of sprays. Systemic pesticides like the neonics commonly used on mums are systemic within the plant. There is no washing it off. I am going to give up on growing fall flowers in my greenhouse, because I don't like being exposed to all the pesticides that are required. Gardening isn't fun when I have to dress up in a chemical hazard suit.
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