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Originally Posted by mat
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Can anyone recognize its problem from this picture of the leaves? Could it be the old soil? I'm afraid to repot it because it looks so sickly I worry I'll just kill it.
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The symptoms on those leaves are somewhat typical to those of powdery mildew infections caused by a fungus that attacks a wide range of ornemental plants.
However, one of the leaves show symptoms that could also be due to red mites infestation. You can check if there is really such an infestation by shaking the leaves over a white paper to see if there are some minute reddish looking insectes moving on the paper. You should also see some webing on the leaves when there is a heavy infestation of such mites.
As for the powdery mldew, it is not easy to control this disease especialy when leaf surfaces are completely infected like those shown on your pics. Those leaves should be removed from the tree and you can spray the rest of the leaves with a fungicide for powdery mildew recommanded in your area. But don't expect the infected leaves to become normal after the sprays. It is only the non-infected leaves that can be protected from infection.
Here is a link that may help you treat for this disease :
http://www.ehow.com/how_3035_detect...nt-powdery.html