Hi,I have managed to keep this ficus alive for 5 years and it seemed to be doing well until recently some of the leaves started to turn yellow then brown and fall off at least 50% of them.I noticed the soil had become compacted so I repotted it into a slightly larger pot with better drainage and a better aerated potting medium, about a week ago, today I noticed this patch of what looks like white mould on the trunk.What could be the cause of this? And how should I physically remove this mould from the tree? And protect the tree from it? Please help 




