Don’t Prune Oak Trees in Spring, Summer
Oak wilt, caused by a fungus, makes oak trees suddenly wilt from the top down. Symptoms are most likely to appear from June through September.</div
>Have an oak tree on your property? To keep it healthy, don’t prune it from mid-April through the summer. That’s a key time for infection with oak wilt, a serious disease that can weaken white oaks and kill red oak trees within weeks.
Oak wilt, caused by a fungus, has been reported throughout the Midwest, including Michigan, said Ryan Wheeler, invasive species biologist with the Michigan Department of Natural Resources.
Red oaks are most susceptible to the disease. These trees have leaves with pointed tips and include black oak, northern red oak and northern pin oak. Trees in the white oak group have rounded leaf edges and include white oak and swamp white oak. They are less susceptible. Read more







