I have this juniper tree for 1 1/2 years. It was doing great untill recently. About couple months ago I noticed that some branches of the tree started turning yellow. I took a close look at these branches and noticed that the foliage has tiny rounded white patches with some brown in the center. These patches can be easily removed without damaging leaves. There are no insects or web present. I don't think that it's spider mites.
I removed several most infected branches, but there still some left and I think the patches are continuing to spread. The tree still has several green uninfected branches and trunk looks alife. I took the tree to couple bonsai nurseries, they couldn't identify the problem, although one guy told me that there was a draining problem in the pot and he fixed it. So I don't know what is the problem: is it a root problem because of the poor draining or it's some kind of fungus. I'm not sure how to treat it: repot the tree or start spraying with chemicals or any other suggestions. Please help me.
I live in Southern California. Tree stays outside all the time and gets direct sunlight from about 4pm to 7pm. I watered it pretty frequently (which I think the main cause of the problem). I didn't repot it or prune it since I got it.
I'm sending the picture of some branches of the tree. Unfortunately the spots are too tiny to be seen in the picture
