| Hi Donna, Hard to tell which pathogen is the basis of the fungal infection. However, you can try a couple of things. Firstly, you need to ensure that the plant is not wallowing in a wet root zone. Sometimes drainage in gardens can be affected over time and surface as obscure plant health issues. Should you be satisfied with the drainage I would recommend you do the following: 1. Apply a solution of Seasol as directed on the bottle immediately.
2. Remove or clean away any dead or obviously diseased bark from the plant. Paint that area with a paste of Copper Oxychloride. This may assist if any bacterial infection is present.
3. Go out and buy some Yates Anti Rot Phosacid. Spray over the foliage and apply to root area as well . This is a broad range systemic fungicide which usually provides excellent pathogen defence.
4. When the weather warms up a little apply small amount of organic fertilzer such as organic life or better still some cow manure. Finally, cross your fingers and see how you go. Regards,
Ted | 
