grape leaves turning yellow

[vinemouse]

some leaves are turning yellow and dying, no sign of bugs. Regularly watered once a week. Any info would be most appreciated.

[vinemouse]

[Digeroo]

I had quite a problem with this last year.  Gave the vine a good handful of blood fish and bone, the leaves that formed after the feed seemed to be a lot stronger.

[johhnyco15]

a liquid feed thats high in nitrogen should sort it out may i enquire how long the vine has been inplace