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Help us locate a "survivor" ash tree


Researchers at the Northern Research Station, NRS-04, Delaware, Ohio would like to expand current efforts to screen ash trees that may be tolerant or resistant to emerald ash borer (EAB).

During an infestation by EAB, it is typical to see a mix of healthy, dying, and dead ash trees.  Usually those healthy ash trees are simply the last to die, and will quickly succumb to EAB within a few years.  However, in some locations, we have found a small number of ash trees that survive the infestation and remain healthy.  We collect small branches or twigs from the most promising trees for grafting and propagation at our laboratory, then we grow and test the trees for tolerance or resistance to EAB.  Our preliminary results look promising. To facilitate this effort we are asking for your help to identify large ash trees in areas that have been infested by EAB for a very long time, where typically over 90% of the large ash trees have died at least two years ago.

We are starting with 10 counties in southeast Michigan and 7 counties in northwest Ohio, and we will expand the target area each year.  If you have a healthy ash tree but you are not yet in the target area, please keep watching the tree and enter it when our target area expands to include your location.

Ash Tree Selection Criteria:

For additional reference, you may wish to review the following publications:

Step 1: Locate the Ash Tree

You can start by entering an address (actual street address, including city and state; a place (Willow Metropark); or zip code) or a latitude and longitude pair (42.280, -83.737) and click . You can refine the location using the zoom controls and dragging the icon to the correct location. Switching to "Satellite" mode may help you locate the individual tree.

This is your current location.

Enter an Address or Latitude & Longitude:

Done locating your tree? Add the tree information

Step 2: Provide Information About the Ash Tree


This location is outside of the counties in the targeted area.

We are only collecting ash trees in 10 counties in southeast Michigan and 7 counties in northwest Ohio.


DBH in inches:
[Learn how to measure DBH]

Circumference in inches:
Ash species
(if known):

Tree canopy health:
Healthy Crown Unhealthy Crown

Seeds present on the tree?
(if known):

EAB symptoms:
(Check all that apply)

Location characteristics:
* Land owner contact information for identified tree:
* Person submitting this information:
Submitter affiliation:
(Check all that apply)

Other affiliation:
Additional Notes:
*Required fields 

The identified ash trees will be compiled in a database and prioritized for sampling. As funding becomes available, we will contact land owners for permission to obtain cuttings for propagation and testing of the high-priority trees.  Thank you for helping us with this important research!

For more information, contact Jennifer Koch and Kathleen Knight.