Emerald Ash Borers, while native to Asia, first arrived in the Midwestern United States over ten years ago and have caused the destruction of millions of Ash trees since. It is believed that they made their way to Fairfax County in 2003 through an infected shipment of nursery stock delivered from Michigan to Prince George’s County, Maryland. Although the previous outbreak was quickly contained, after a five year hiatus, about 20 to 30 trees in the Herndon area have recently been diagnosed as infected with EABs.
These insects cause the destruction of the tree by feeding on and damaging the cambium, which allows for water and nutrient distribution from the roots to the foliage. Although research is being done, as of yet, there is no preventative to treat this insect and more often than not, trees infected with EABs must be removed. Trees infected with EABs will exhibit dying leaves, a severely thinned canopy, broken branches, and distinct D-shaped exit holes in the bark.