I always cut it off below the wire a few inches. I think the lower wire branches are fine though I am FAR from an expert on the subject. One suggestion though.....get rid of that grass around it. Make that a 6' across mulched spot and the grape will thank you. Grass is an awful good competitor for water and nutrients.

Thanks for the advice. I'll probably trim the vine back below the wire and let two shoots develop for the upper arms.

One aggravating point, come winter, I will have to transplant this concord to a different trellis...it was accidentally planted on my muscidine trellis.

Here in my locale, the source of truth for most gardening approaches is the "Sunset Western Garden Book." It recommends letting grapes sprawl and grow unchecked the first year. You want it to develop as many leaves as possible so that it grows stronger roots. Then you select the sturdiest shoot to train in the first winter.

My Crimson Seedless starting to color up:

Here is a link that might be useful: HOW TO GROW GRAPES