By Canalhopper
Denbighshire,
United Kingdom 
Should I be worried about this on my vine?
17 Jun, 2021
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it looks like grape vine blister mite. the swelling is a gall caused by the sap sucking mite.
The RHS suggests it wont affect fruiting. If there are only a few leaves affected remove and either burn or place in the household bin. link is to the RHS advice page.
https://www.rhs.org.uk/advice/profile?pid=789
18 Jun, 2021