What Is This Ball Shape Thing on Grape Vine?

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So far it looks harmless. But I want to know what this is.

I did not prune this vine much, and I have two main trunks growing from the original two buds. So not worried about this at this time.

Grapeman, have you seen this?
 
Just received an expert opinion:

That is a gall formed by an insect. (a midge). Nothing to worry about, by the way. Nothing you can spray to control it either. Won’t spread from year to year.
 
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