American White Ash, Fraxinus americana, is a species of ash tree native to eastern and Central North America. The largest of ash trees. The Emerald Green Ash borer has been in New jersey since 2014 and they destroy ash trees. Treatments would vary including yearly spraying and injection which might help on those trees that are not infected or just beginning to see the ash borer. The ash trees with the emerald ash borer would be best aproached by the take down and removal of the tree which presents a good amount of infestation. You can look for small holes shaped in form of the letter D, bark peeling,flecking, and branch die back from the top and outside branches. Feel free to contact us with any concerns on your ash trees.