Emerald Ash Borers are small beetles that is native to Asia and some parts of Russia. In its native environment, natural predators prevent them from overwhelming the trees in which the beetles live. In the U.S., the lack of natural predators means that the beetle can infest and eventually kill the trees in which it lives. Emerald Ash Borers, as the name suggests, are green and tend to prioritize ash trees for their larvae.
Emerald Ash Borers kill ash trees through the deposit of eggs in the tree bark. When the larvae hatch, they burrow into the bark and subside in the tree, where they will eventually consume all of the tree’s nutrients. The process of tree death from Emerald Ash Borers can take several years, as the tree becomes girdled from the larval infestation.
There are currently few treatments and preventative measures for infestations of Ash Borers; the simplest and most common being an addition of systemic pesticides through a soil drench. However, new treatments are undergoing experimentation; namely the addition of tiny parasitic wasps which are a natural predator to the Emerald Ash Borer larva. Trees that are heavily infected may need to be removed, and surrounding trees should be inspected for infestation.