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Forest Invasivesbreadcrumb separatorLearn and Participatebreadcrumb separatorEAB-Resistant Ash Tree Survey

Emerald Ash Borer-Resistant Ash Tree Survey

Researchers with Natural Resources Canada, with help from the Invasive Species Centre, are embarking on a quest to find ash trees that have survived the emerald ash borer. The goal of this project is to understand what is special about these trees. The first part of this research is finding these lingering ash trees. Once we’ve found the trees we will take samples of the bark and leaves to conduct chemical and genetic analyses. These analyses will help us understand if there are traits shared by these survivors that could inform future research on developing ash trees that are resistant to attack by the emerald ash borer. 


How to identify an ash tree

Below are the leaves of three species of ash tree common to Ontario: green ash, white ash, and black ash. 


How to identify emerald ash borer infestation

If your ash tree has been infested with the emerald ash borer, you will see several signs and symptoms. These include crown dieback, bark deformities (incl. vertical cracks and shoots growing out of the lower trunk), D-shaped exit holes, woodpecker feeding holes, and yellowing foliage (FIAS, NRCan, 2013). You may also see larval galleries (pictured below, right) beneath the bark. 

               Photo: Daniel Herms, The Ohio                                              Photo: Taylor Scarr, OMNRF (edited)
                State University,

If you've seen signs of emerald ash borer infestation, you do not need to report your sighting in this survey. This survey is only for healthy ash trees. You can learn more about emerald ash borer here.