Hi Everyone

I have a beech hedge which is in it's third year now. Every year it demonstrates some weird growth on the leaves which nobody seems to be able to identify. I also get some persistent sticky white fly on the leaves which I spray but which are tough to get rid of. the growths don't seem to harm the hedge too much but it doesn't help it either. I'd appreciate any ideas about what it is and how to get rid of it and if there's any connection between it and the white fly. (I have been told not) I live in Belgium (so does the hedge) if that adds anything to the picture. Speaking of pictures there's one attached.

Thanks in advance