Any specific brand or type?
May 09, I can't say definitively what is causing the splitting bark on your live oak, but I can say it is a reason for concern. There are several possibly explanations. It could be from changes in moisture (dry to wet), temperature, and possibly from the ice storms we had this winter.
The drought has caused stress on a lot of trees the past three years. The fungus may be carried from tree to tree by various insects and through root grafts. Sap feeding beetles are important in the short range spread. Red oaks which wilt in the late summer or early fall develop spore mats under their bark during the next spring.
However, these have always been shown to belong to one of a couple of other species that are also capable of building up high local populations.
As the mats develop, the bark sloughs off or ruptures exposing the fungus. Oct 25, Oak trees are bound to lose at least some of their foliage, especially when the cool fall and winter weather arrives. But if you discover significant patches of open, missing foliage, it could be a sign of Diplodia canker, which is a fungal twig and branch disease that affects certain species of Reviews: Jan 18, There are fungal diseases, such as oak wilt, that attack the vascular systems of red oaks and live oaks, but that wouldn't be the case here on your post oaks.
Hypoxylon canker is a disease that Author: Howard Garrett.