Grape cluster issue

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See:

http://articles.extension.org/pages/33106/causes-of-poor-fruit-set-in-grapes

From the single picture: there seems to be slight white film and dead tips would suggest to me a fungus. The health of the canopy may not be relevant even if a fungus is the problem. If the clusters were not treated at the most opportune and appropriate time before flowering, and/or if especially poor weather occurs during the bloom, fungus issues may develop just on the clusters.
 
Definitely fungal. I hardly ever see any issues on mine except for botrytis but that's on mature clusters. I'd say DM.
 

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