Whats Eating My Lakemont Grape Vine?

[Artisan]

I have a second year Lakemont grape vine and I have noticed that something is eating either chunks and/or holes in the young leaves. I have looked for parasites both on and under the leaves and also on the stems but can not see any little creatures. When I planted the vine this time last year it grew on well without and problems.

Can anyone give me some information what the parasite may be and how to overcome the problem.

Any help would be gratefully received.