What is causing leaves to die back on live oak?
Two oak trees in my front yard have twigs that are dying back throughout the trees. Both seem to have more at the top of the trees, especially in the center. This is a picture of one at the bottom. Overall the tree looks fine, and most people would probably not notice the dead portions dispersed throughout the tree. I want to make sure this isn't the start of something serious, though. The trees have been in the ground for about 12 years and are about 15-20 feet tall. Also, these two are in the middle of a group of four live oaks. The two trees on the ends of the group don't seem to have these dead twigs, or at least not nearly as many.