Maple tree insect or disease?
Saginaw County Michigan maple trees
The browning is a consequence due to the yellowing between the leaf veins. This is not a disease but Scorch a result of heat stress. In this section of the tree the heat is causing water loss faster than what roots can provide. We often see this in July and August. It can be worse on trees along a road or next to concrete where the heat is the greatest. Is this mostly on one side of the tree? Scorch affects leaves the most towards the ends of branches and at the top of a tree. Furthest point water has to be transported. I know it was just last month we had too much water but we have definitely turned a corner on the summer. I have the same problem with a maple and it is a plant that I will water during dry and very hot periods.