My mom has a very beautiful Kousa Dogwood in her yard in SE Mass. It has been in the ground for almost 25 years and has a very graceful multi-trunk form. It has always been healthy and happy..until this month. After leafing out and blooming profusely, as usual, it very suddenly dropped many leaves. The leaf drop is not evenly distributed. Some branches have lost most of their leaves while other branches have not. At first I thought it was catapillar defoliation, but my brother (who cuts her lawn) informs me that it was not being eaten. The leaves fell from the tree, shortly after that last bout of very heavy rain. Could it be a fungus? Some of the remaining leaves do have dark brown patches on them--similar to anthracnose on the other dogwoods. But I thought Kousa was not susceptible to that fungus? Any ideas? Do you think it will come back? For what its worth, I have not seen any other Kousa's in our area with this problem.