Autumnal roses

This year the roses suffer quite a bit; we had a long spell of hot summer so they decided to go to sleep but as soon as autumn arrives with cooler weather they bust back to life making up for lost time and started flowering their heads off. Unfortunately this gives the possums a welcoming feast too. I lost most of the roses along the fence to the possums but managed to save a few that are placed away from the fence.

I've tried all kinds of tricks to rid of the pesky possums but nothing works. The last resort is trapping them and releasing them elsewhere but that's illegal and the missus won't let me.