The bark on a pecan tree has vertical piece loose due to growth or rain. Any wounds harm trees and makes places for decay to start. Back way off on the water and they will not return. They can be grown here but do freeze back in hard winters. They like well drained soil.
Tree is better for Austin area.
Properly watered trees do not get knees. Client has sprouts coming up under a live oak tree. They believe these to be from acorns. These sprouts could be from the tree roots. Would need to make certain they are from acorns before treating.