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bonsaiTALK Master Craftsman
Join Date: Jan-2002
Country: USA
Posts: 861
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It's the new leaves that are most important. If those look good then I don't think you have a big problem. Many of these are greenhouse grown and will hold leaves over winter. Your tree is probably just in the process of dropping old leaves and replacing them which is a yearly event with Chinese elm. I would try to give it morning sun and afternoon shade though, especially in the hottest part of summer.
It's time consuming but the best way to get rid of scale is hand picking. Insecticides and soaps won't do much to the adults with that hard shell unless you can somehow get it to their soft undersides.
Tony
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