I don't see any wilting and turning black in the pictures. From those words, it sounds like one potential issue could be a mold. Within that possibility, there are a few types it could be. A black mold seems to get black cherry plants for me nearly every year at some point. If you want to treat for possible mold, there are several options. I've usually removed the visibly diseased leaves and sprayed the rest with Serenade and Excel G and sometimes other things. There has been a threat about a new anti fungal floating around saying that this new treatment actually systemically treats plants with disease. If you determine that a mold or fungus is your issue, you may want to look for that product. Good luck.
Dewayne mater
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