Sign In

Trending Searches: Job OpportunitiesParks | Library

Emerald Ash Borer

          Emerald Ash Borer                                   
         EAB Adult, David Cappaert,                  



Quarantine for Emerald Ash Borer:


Virginia is under Federal Quarantine to control the movement of the Emerald Ash Borer.  Under this quarantine, the regulated articles, (which include: any life stage of the Emerald Ash Borer, Ash trees, green (non-heat treated) ash lumber and ash wood products, as well as hardwood firewood and wood chips), are no longer subject to localized movement restrictions and may now move freely within the state. The Virginia Department of Agriculture and Consumer Services has up to date information on quarantines.

To prevent the introduction of other invasive species, firewood and other untreated wood should not be moved far distances. Generally, it is recommended to move untreated wood no farther than 50 miles from its source, ideally under 10 miles is best.


Funding Notice for EAB Treatments: The Virginia Department of Forestry has a new cost-share program that will cover a portion of the chemical treatment needed to protect healthy Ash trees against Emerald Ash Borer; you must still pay for at least 50% of the treatment costs and the treatment must be performed by a Virginia State Certified Pesticide Applicator.  Trees must have at least 70% of leaves remaining in their canopy and be at least 12” diameter, 37.7” circumference, at 4.5 feet from the ground. Only injection treatments will be approved for our area. You must apply to participate in this program and meet certain criteria for your application to be approved- you can download the application here.

Applications for this year are closed.  Please contact Meredith Bean at the Virginia Department of Forestry with questions concerning the program: (434) 220-9034,  Please contact our branch at 703-792-6279, with questions about EAB in Prince William County or for help determining if your Ash tree is healthy enough for treatment.


Emerald Ash Borers (EAB) are originally from eastern Russia, northern China, Japan, and Korea.  The original infestations were found in 2002 near Detroit, Michigan, and traveled to Maryland and northern Virginia from Michigan in infested nursery trees.  Their populations are increasing rapidly because they have few effective predators here. They have already killed tens of millions of trees in North America, and show no signs of stopping.  By the end of 2011 they have already killed more trees than Dutch Elm Disease.


EAB attacks all species of Ash (Fraxinus spp.), and causes around 99% mortality outside of EAB's native range. EAB has also been found to affect White Fringe Trees, Chionanthus virginicus, a species native to the eastern US.  The most damaging stage of their life cycle is the larval stage, when they tunnel around under the bark of the tree, affecting the tree's ability to transport nutrients and water.  After that they pupate, emerge as adults through distinctive 1/8 inch D shaped exit holes, disperse, mate, and lay eggs on the bark of ash trees, starting the process all over again.


EAB in Prince William County

EAB was first found in Prince William County in 2010.  Subsequent years of trapping (using large sticky purple traps) indicated that Emerald Ash Borer is present across the county - trapping is no longer being conducted by our branch.  Many ash trees in the county show symptoms of EAB; epicormic branching (water sprouts), canopy die back, woodpecker damage, and bark splits.  The 1/8th inch diameter D shaped exit hole and larval galleries are diagnostic signs that EAB is present. Visit for additional information.

Pesticides can be applied to individual trees to protect them against EAB.   Trees must be healthy and have at least 70% of their leaf canopy remaining to be a good candidate for treatment.  Pesticides must continue to be applied on a scheduled basis for protection.  Label directions and rates must be followed.  Different pesticides are available to homeowners or state certified pesticide applicators. Many ash trees will not be treated with pesticides; some trees may be too unhealthy, too small, or pesticides may be cost-prohibitive or undesired. Almost all ash trees that are untreated will continue to decline and die. Trees should be monitored carefully- we recommend contacting a certified arborist to evaluate tree risk and to apply pesticides or remove trees as needed.  See our "Guide to Ash Trees and the Emerald Ash Borer" for more information.

Interested in learning more about Ash trees, EAB and Prince William County's efforts? Check out the "The Tale of the Green Intruder" for more information.


 Contact Us

14879 Dumfries Road
Manassas, VA 20112
Phone: 703-792-6279
Fax: 703-791-3092


You are now leaving the official Prince William County Government website.