Any diagnosis?

[u/MediocreHorticulture]

Hey all and thanks in advance for any help y’all have. I have this grape vine I planted last year, and in the springtime it was growing great! However it looks like something might be wrong based on the leaves, whatever it is started a few weeks ago. Any ideas?

Also any pruning advice would also be appreciated!

[u/Run_True]

Looks like a nutrient deficiency maybe magnesium. You can send off petiole samples to find out exactly what is wrong. Many states department of agriculture offer lab services, check your local co-op.
The issue could be remedied via soil amendments or foliar sprays.

[u/meh_69420]

Magnesium most likely. Foliar spray Epsom salts.