Tree Gall. Most insects that make galls are tiny wasps. Galls on trees are caused by insects laying eggs inside or feeding on the branches of leaves of what insects cause galls to form?
All galls are formed for the same sort of purpose: Gall mites cause growths or galls to develop on the leaves of red maple trees. Leaf galls, alarming bumps on tree leaves, aren't insects or diseases. They are the tree trying to heal itself.
The galls typically form on the roots and crown, but they can form on the stems.
The health of the tree is not affected and special. All galls are formed for the same sort of purpose: Plant gall damage is usually an aesthetic problem and is not considered serious. They are the tree trying to heal itself.
