Advice. I have a Viburnum opulus roseum - Snowball Tree, it’s around 50 yrs old . For years it has been beautiful but the last couple of years it has suffered from an attack from the viburnum beetle . Is there anything I can do to stop this from happening, I don’t really want to use sprays . Should I prune it back harder? I have attached some photos showing how it was ,also after the attack from the beetles and one from now . Any help would be much appreciated thank you.