I need help with an infestation on my 30 year old Wye Oak seedling. Some...
As you may be aware, oak trees are very attractive to gall-promoting wasps and midges. There is no treatment necessary. The galls are actually produced by the tree as a defense mechanism to isolate the egg and hatchling from interfering with the vascular system of the tree. Even when the tree suffers leaf drop, it usually occurs late enough in the season to allow the tree to have stored enough energy for next year's re-foliation.