Emerald ash borers (EAB) only attack ash trees.  Some ash trees in Prince William County are already dead or dying, while others seem fine. It is very hard to tell  that an ash tree is infested until the infestation becomes so severe that the top of the tree begins to lose its leaves and die.  It can take up to 3 years to begin showing symptoms.  It might take a few years for EAB to reach all of the trees in Prince William County, but it is only a matter of time.  It is important to act now to figure out where the ash trees are!
 
Most Important:
Don’t move firewood! Don’t take it with you to go camping, and burn it all where you buy it!  Emerald Ash Borers (EAB) and other invasive insects will infest firewood in addition to trees.  A lot of the problems we have with EAB and other insects were caused by people taking them with them when they moved or went on vacation!
 
Ash Tree Identification
In order to deal with EAB, you need to know if you have ash trees on your property.  Ash trees are easy to identify once you know what to look for.  First, ash trees have a compound leaf.  There are 5-11 leaflets attached to a rachis making up each individual leaf.  Second, ash trees are opposite, meaning that whenever you see a branch, leaf, or bud, there will be one directly across from it.  Mature trees also have tight bark with diamond shaped ridges and furrows.
 
For further help in determining if you have ash trees on your property, check out the documents on this website.  Signs that your ash tree is infested with EAB include top down dieback in the tree crown, increased woodpecker activity, epicormic or “water” sprouts on the lower trunk or crown, and/or 1/8th inch D shaped exit holes.
 
Treatment
Treatment does exist for individual trees.  While this won’t save all of the ash trees in the woods, you can save the ones in your yard by using a chemical treatment.  Trees can be saved even if they are infested, as long as no more than 25% of the crown has died. Keep in mind that treatment will have to continue for the life of the tree, or EAB will attack once treatments stop.  Current research suggests that any trees within 15 miles of a known infestation should be treated.  Click the map on the right to see if your area is at risk.
   
If you decide to use a tree care company to treat your ash trees, you should make sure that they are properly insured and have the correct permits for the chemicals to be used. It is always a good idea to use a company with a certified arborist on staff.  
 
Want to Learn More? 
Here are some excellent websites that will give you more information about the life cycle, dangers posed, and what can be done about all of the exotic forest pests in Prince William County.
 
 
 

 Contact Us

 
14879 Dumfries Road
Manassas, VA 20112
Phone: 703-792-6279
Fax: 703-791-3092
Email: gypsymothmosquito@pwcgov.org