Great info that everyone has contributed here. I'm using up the last of my Natria Disease Control QST 713. Who knows what the shelf life is, but I fortunately haven't had issues this season.
One thing that is consistently true for all of these products is they work better at prevention than treatment. It's never a surprise if someone buys a fungicide because of an outbreak then are disappointed they can't reverse the situation. Instead, I think it is important that it becomes a part of your seasonal plan to keep the plants healthy just like potting up seedlings, pruning suckers, etc.
Next season I'll give Bonide Revitalize a shot and hope it can perform as well as QST 713 has for me.
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