My Chinese Elms have been dropping leaves like crazy. They are mature trees. They were put in about 12 years ago. This leaf dropping is something new the last couple of year. This year has been a bad year for fire blight in apple and pear trees. Also, native sycamores have been hit hard by anthranose, destroying the first leaf, secondary leaves are starting to come out now. However, the leaves that are dropping off the Chinese Elms are not brown or blackened. They appear to be healthy.

Does anyone have any knowledge or experience with this?