What's eating my tree

Hi all. I have some trees/ bushes in my garden (unsure what tree!) But gives good privacy but something is destroying them.
Can anyone advise what it is and how to stop it eating it. The main tree is above a fish pond . Don't want bug spray in that though. It's awful whatever it is. Ravishing the whole tree.
I have seen a few bugs on it as pictured in 3rd and 4th image . See pics. What can I do ? I've chopped most of the munched off but clearly the bug will be hiding in the remaining good stuff. The other tree , well I may as well set fire to it !!

I have the bug spray shown but it does say keep away from ponds . Thanks for your help guys ..