I have an elm tree (50 years old/approximately 30-40 feet tall) that has leaves that are wilting, partially turning brown, and falling off. What is it and what can be done to save it?
There are several thing that could be wrong here. It is very difficult to tell without seeing the tree, though. The two most likely causes are Dutch Elm Disease or a fungal leaf spot. The second cause requires applications of the proper fungicide, fertilization, and treatments to prevent boring insects from damaging the tree. Dutch Elm Disease is very severe and will require specialized applications to attempt to save the tree.
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