Light Brown Apple Moth Caterpillars may be active in bunches, particularly in tight bunched varieties where they are shielded from high temperatures. Pictured above; an egg mass has been laid on a developing berry.
LBAM caterpillar feeding on the leaf surface.
Light Brown Apple Moth don't damage leaves very much and not a great concern in young or grafted vines. The only exception is if they are active in shoot tips.