Ficus with black bumps & sticky leaves
There is a ficus tree in my office that is suffering from significant leaf drop. We have had it for about a year, in the the same place, in an area with good light and no drafts. It has never been very stable, consistantly losing leaves, but also growing new ones, but it has never looked "full and healthy".
Just last week, most of the leaves turned yellow and fell off. There are only 2 major branches with leaves still growing. Also, some of the leaves look like they are wet, but there is actually a sticky substance on them. As I looked closer, I noticed that many of the branches have black bumps on them (both healthy and bare branches). These bumps come off easily, and look like vegetation- not bugs. The bumps and stickiness are not on another (healthy) ficus in our office.
Could this be a disease? What can I do (if anything) to save it?