Emerald Ash Borer
If you have Ash trees, you will likely notice that they are in a state of decline as a result of an infestation of Emerald Ash Borer (EAB). You may also notice increased woodpecker activity, as the woodpeckers search for EAB larvae in the trees. Emerald Ash Borer is an Asian borer that feeds on the conductive tissue of Ash trees. If you look closely at your trees, you may see small holes and/or snakelike trails in the bark, which indicate an infestation.
While there are some insecticide treatments for EAB, if the tree has lost 50 percent or more of its canopy, it is too late for treatment to be effective. Dead Ash trees quickly become structurally unsound and should be removed by a professional who will take the proper safetey precautions.
For more information on EAB, please see the following links: