Posted: 12/06/2016 at 11:43
I think stems being damaged further down is far more common. Snails in particular like to graze on the surface of stems and this causes growth above to die off. Having said that, those leaves do look like they have a fungal infection of some sort so I would cut any affected ones back to just above a leaf joint a few inches below the damage. If the remaining leaves continue to die, I take the whole stem out to just below ground level. I'm not an expert and the above is just what I do myself.