I'm with Bigwheel some of that needs to wine! My friend is a big Wino Man. He distills some each year and makes kick ass grappa.
I had a huge grape crop this year until the rains came. Mildew and black rot fungus took about every grape.
I don't do chemical fungicide sprays, just copper which is OG listed. Problem it has no residual and it washes off with each rain.
The black rot I mainly control by removing any "mummies" left in the vines from last year, so there is no spores to infect the present years crop. I usually don't have mildew problems but the wet weather just made it spread.
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