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What causes this color change

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berrycrush

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What causes this color change? sunburn? infection? It only happens to this Concord vine on every one of its clusters.

 

salcoco

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it looks like sunburn. I would only be concerned if the grapes start to shrivel. in future ensure that at least one leaf covers the cluster. it is kind of a balance between not shading to insure ripening and shading to insure intact clusters.
 
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