Although natural, some of the mixtures are quite potent. You might want to spray early on in the season before you need to respond to any fungicide issues, because once fungicides. Vegetable oils or neem oil.
Diy prepare soil for vegetable garden
Diy compact vegetable garden
Diy vegetable garden shade
EZ Homemade Organic Fungicide for Squash & Cucumber Treat & Prevent
Before covering your whole plant with your homemade mixture, spray a little on a few leaves to see if there are any adverse effects.