One thing you’ll come across eventually if you read much on this: Muscadines and scuppernongs require very little care, and not many pests bother them, and grapes produce resveratrol as a defense against fungus diseases. It’s thought that, since muscadines often aren’t sprayed at all, that they produce more resveratrol fighting off fungi with no assistance from man. - So, it might be best to not spray unless absolutely necessary.
A lot is this is probably still being studied, but I’ve seen that stated in several different articles.
Ya, it’s called NAC folks ... (N-Acetyl Cysteine) google it and the flu