Sawflies

Hello

My poor silver jubilee has taken a battering from what I think is sawfly - lots of round holes in the leaves.

I read up and apparently the best thing to do is just pick the caterpillar offspring off. I've been trying but I've only found two an there are clearly more!

Cosmetically it's not great because they nibble the rosebuds. But is there more damage being done - if so what are my other options as I'm clearly failing at spotting the culprits!

 

rhs advice on sawflys hope this helps

http://apps.rhs.org.uk/advicesearch/Profile.aspx?PID=221