Garden Q&A: What's eating my viburnum, and what can I do about it?

Whether you're a gardening beginner or expert, Irish Examiner columnist Peter Dowdall has the answer to your questions  

The pink and white Viburnum tinus laurustinus 'Lisa Rose' in flower. File picture

Question

My Viburnum tinus is being eaten and is very badly damaged. What's causing it, and what can I do? It's an old plant.