Cedar Elms seem to be getting more and more problems. They tend to get mildew, elm leaf beetles, mistletoe, and aphids. You could try the sick tree treatment. The carpenter ants are there because it is in stress. Taking them out with something like orange oil will only have temporary results, as more will come. Is there another tree you like that has less problems? Check out Howard Garrett's "Texas Trees" for reference to different trees and their characteristics. "Plants of the Metroplex" (also by HG) is a great source as well.
_________________ Nadine Bielling Moderator Gardener Exchange Forum
The Laws of Ecology: "All things are interconnected. Everything goes somewhere. There's no such thing as a free lunch. Nature bats last." --Ernest Callenbach
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