I have an unseen enemy chewing my peas >:(
While weeding the row, I found a pile of pea stalks neatly trimmed and arranged in a nest. Not inhabited and now in the compost bin.
I think that was Mrs Mouse and now that I have removed the undergrowth, hoping she won't come back.
But Tuinman, looking at your pic it is an exposed site, so I'm not sure your's is the same problem - does the site have mice?? Perhaps you could try netting them or more wrapping the net around the outer canes?
If you use them, sprinkle the pellets - I have found the white Growing Success pellets to be effective.
Good luck