Fungus a common problem

Fungus infection, a common problem especially during wetter seasons. This probably was started by a nip by the birds. Treatment is not difficult. Just cut off the infected areas. I would usually just cut away part or most of the leaf if it is not too near the growing crown. Use a lighter to sterilise the cutter before and after use. Apply fungicide or fungicide powder to the affected   areas and allow it to dry.