Oak wilt kills trees in the red oak group (red, black and northern pin oaks), and also harms trees in the white oak group (white, bur and swamp white oaks). Help protect oak trees from oak wilt— don’t prune or otherwise “wound” oaks from April through July. Learn more about how to protect oaks by searching for the keywords "oak wilt" at dnr.wi.gov or by viewing this excellent 3-minute video from WI DNR https://youtu.be/CLvSgKr5uY4