Whats wrong with this leaf?

[Swamper]

Whatever is wrong with it, I personally would cut it off at least about half way back, treat it with some fungicide and hope for the best. The other one looks a little spotted around the edges too but Im no phal expert so I dont know if that's something to be concerned about. Be carefull with your watering, like Kiki said. Where do you keep it and how much water is it getting? The roots seem to be ok, at least the ones I can see coming up.