EAB is an invasive pest from Asia and threatens the ash tree population in the United States. In Michigan alone it has killed over 20 million trees since its discovery in 2002. Through a combination of natural spread and human activity it is now found in Ohio, Indiana, Illinois, and Maryland, placing millions of additional ash trees at risk. It will continue to spread and is probably a permanent member of our insect population.

Attacks Ash Trees
The Emerald Ash Borer has predominantly targeted green, black, and white ash in the US, although in Asia other types of ash have also been infested. Ash do not have natural defenses to the Emerald Ash Borer, and trees of all sizes and conditions have been killed.

What To Do
Despite the challenges presented by the Emerald Ash Borer you can take steps to protect your tree. Current insecticide technology, Xytect, can protect your tree from EAB and other insects. With one soil treatment your tree will have year long protection. Success is ultimately determined by both tree condition and treating the tree before it is challenged by Emerald Ash Borer.

Ash trees located within 20 miles of the nearest EAB infestation should be treated preventively. However, because symptoms from EAB can be difficult to identify in the early stages, and in most cases EAB has been present in an area multiple years before it is officially documented, high value trees greater than 20 miles should be considered
for treatment.

Emerald Ash Borer Symptoms
Adult beetles cause relatively little damage, but the larvae feed on the xylem layer and disrupt the movement of water and minerals within the tree. Early symptoms can be difficult to diagnose, but eventually the canopy dies from the top down. Trees may be infested for several years before symptoms are visible in the canopy.

The links below give a lot of useful information to the threat of EAB.
Please visit these links for more information:
 
http://www.emeraldashborer.info
 
http://www.snr.missouri.edu/forestry/extension
 
http://mdc.mo.gov/forest/health/ashborer