What is killing the grapes?

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Hey folks,

Never cared for grapes before. Went on a long holiday, came back, and they looked like this. [URL alternative here if file is too big: https://gyazo.com/c14e98b2b5c0785b6480d17d0d18ae73]

Any idea what I should do? I'm in northern Alabama, if zone info is needed. I've attempted differing amounts of sun / water, and can only assume it's a pest / nutrient issue?
 

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La Porte Texas
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Hey folks,

Never cared for grapes before. Went on a long holiday, came back, and they looked like this. [URL alternative here if file is too big: https://gyazo.com/c14e98b2b5c0785b6480d17d0d18ae73]

Any idea what I should do? I'm in northern Alabama, if zone info is needed. I've attempted differing amounts of sun / water, and can only assume it's a pest / nutrient issue?
It looks like Black Spot Fungus, a common disease. It is windborn and difficult to control. The following link might be of help.
https://alchetron.com/Black-rot-(grape-disease)-1928636-W
 

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