Grape leaf blisters

Hello! It is June 6, 2017 at 6:00pmEST average tempature for the past month has been 70°F (20°C) & rainy. I live in Rochester Pa, which is 20 miles North West of Pittsburgh, Pennsylvania U.S.A. I have a wild Grapevine growing along and with a Honeysuckle. Within 1 vine of many shoots of the Grape, and on a few leaves of many & just on 1 vine shoot & 3 leaves there are blisters with a red hue that have growing bigger and darker. A photo is attatched and more can be taken/sent. Do you have any idea? Thanks!
Bill

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1 Comment To "Grape leaf blisters"

#1 Comment By Downtoearthdigs On 06/07/2017 @ 9:23 pm

Looks to be Blister Leaf Mites.

https://www.gardeningknowhow.com/edible/fruits/grapes/grape-leaf-blister-mites.htm ^[1]

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