I have an Arnold Promise witchazel that for the last several years has had all the leaves get brown and crunchy as soon as it leafs out. I tried an antifungal soil drench. I did have a few blossoms this Spring. I believe this started when some rabbits found the bark quite tasty and perhaps weakened the tree. I now create a barrier in winter to keep them out. Should I spray with a fungicide just when the leaves are developing? I really like this tree and would like to save it. I don’t over mulch and clean up around it in the fall. I even replaced some of the surrounding soil. Any thoughts or suggestions would be much appreciated. Thank you.