In the UK I grew Black Hamburg grapes and for those I used the cane pruning method as that generate the more fruit for that particular variety.Moving here I inherited a south west stone wall with two very old grape vines. they are black grapes and that is all I can say about them so far. They were here when I came and I know they grow large fruit and are nice and sweet, but as to the variety, I have no idea. But it is like wine. If you like it, it does not matter what it is called.I thought that growing grapes was a breeze. When the leaves had turned brown just prune them back to the main stem. If you want it to grow in a particular fashion, say up a wall, then just leave enough growth for the vine to expand on with the next years growth in that direction.How wrong can you be. In this area grapes are very susceptible to powdery mildew due to the high humidity in the summer months. They are also very susceptible to being eaten by the birds.To counter the mildew they have to be spayed every 10 days with a copper solution (you can get many chemicals to do this but copper does not harm the bees) which seems to work.
To counter the birds I use paper bags tied over each bunch of grapes just after they start to change colour. This keeps the birds at bay and allows the grapes to swell and ripen as well as breath though the paper. This works very well indeed.I have now built a dedicated grape wire trellis and planted three more seedless table grape vines (2014). We will see what 2015 brings.If you want more detailed information on pruning grape vines I have linked in two very good videos on both cane and cordon pruning here.This my competition in the Jalon Valley, I think they win, but they do make exceptional wine of which is mostly drunk locally (and me).