another photo

Here is a link that might be useful:

another photo

Here is a link that might be useful:

Yikes....it looks like game over. You can try and cut the tip off...remove all black/brown material expose to clean/live area where white sap is found. Use clean instrument and cut at slight angle and put in dry place to heal. NO WATER until leaves start showing.

That is a rot and needs to be cut down to green wood (no black or dark brown)and cut at a slight angle. You can seal after it dries with spackle or tub and tile sealant. Leave it be and hope it does not continue down the plant. if caught soon enough it can be saved.