I live in Freeland on a 3 acre wooded lot. Most of the trees are Chestnut Oak, (I believe). For the past 3 years the trees have been dying at an unusual rate. Can you tell what is causing this and if there is anything I can do to stop it. The majority of the tree are tall, 70-90', and straight. I believe the area was forested about 80 years ago so they all started growing about the same time. Attached is a picture of the typical leaves. Thank you
The leaf in the photo shows a leaf gall and not a reason for any decline. Here is more about leaf galls. https://extension.umd.edu/hgic/shade-tree-galls
Chestnut oaks are in the white oak group and have been declining throughout the state and the cause is not known. They are not susceptible to oak wilt or bacterial leaf scorch. It has been reported by arborists that the age of these oaks is about 70-100 years old. It is possible that this is when the population ages out but we cannot say for sure. Also, there has not been issues with gypsy moth.
Here is a good link to why oaks are declining and other issues