Twigs and leaves falling early from White Oak
Our white oak has been shedding twigs with leaf clusters since early August. I can see they are coming from one section of the tree; there are dead leaf clusters up there i can see that will soon fall like the others. I thought maybe the oak twig pruner but the end of where the twig came off is totally smooth, not with the rough centers. Some of the leaves are green on the undersides but brown and diseased looking on the tops. Hard to get a pic of the twig ends but they are totally smooth, almost polished
There are also many rust colored tiny spots on the leaves that merge into larger patches. Undersides of the leaves are a drab green, the upper portions drab brown. Looking up there are many more clusters/twigs of leaves affected and constantly falling.
Dakota County Minnesota
Thank you for your question. It is difficult to diagnose a plant problem by just looking at dead leaves, and an accurate diagnosis would need to have the leaves examined at your local Extension office (https://local.extension.umn.edu/local/dakota) I suggest you contact them to see if they can do that.
Having said that, my suspicion is that your tree, being in the area most impacted by oak wilt, has this pathogen: https://extension.umn.edu/plant-diseases/oak-wilt-minnesota