We have had a struggling ficus in a large pot indoors for some time. The tree does not really grow, but it doesn't die, either. It loses otherwise healthy leaves at a somewhat faster rater than it produces new leaves. I say "otherwise healthy" because most of the leaves have a distinct covering of whitish spots. On closer inspection these spots are actually cone-shaped with tiny brownish peaks, and they can be rubbed off the leaves with one's thumb or finger. I have posted images of the problem here:
https://sites.google.com/site/235waller/ficus
Any ideas of what this is and how to fix it? We were silly enough to move the tree to another room where it sits in proximity to Wandering Jew-type plant and now the spots jumped there, so they are not limited to ficus.
Any help would be greatly appreciated.
Regards, kkopp