Michelia Alba disease
We bought two of them 2 years ago, they were very healthy, large leaves, more branches and getting tall. And they were separated in different house, about last April 2012 one tree started getting dots on the leaves almost whole tree as seen below, we thought it would be OK to put them in one house which we did, and the second tree is getting the same which is telling me it is some kind of disease that can transmit from one to another :(. We decided to get rid of all affected leaves, but the young leaves still have the issue.
The good thing is that they are still alive and flowers too.
Not quite sure to get rid of it.
Any help/ idea would be appreciated.