In early June, after heavy rains, many of our dogwood leaves died in a short amount of time. The tree is less than ten years old and healthy, but it did not flower as heavily as usual in May. The problem does not appear to be spreading, but many leaves are partially dead, so it is not clear whether the problem has passed. An arborist believes we have botrytis and said that need not treat the tree at this time. What is your opinion? thank you