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Originally Posted by Paul mabbott  The one I get seems to scrape off patches of the underside of the leaf. Looks a bit like a leaf-mine from above but I think bay doesn't have any miners in this country. |
It could be a leaf beetle, they attack May to the end of summer, Skeletonizing the leaf rather than eating holes in it. There is a leaf miner that attacks Holly,Privet,Honeysuckle,Azalea,Lilac and Birch.
I think I have Tortrix moth on mine. These are the only things that come close in my gardening books.