Hi Andy,

Unfortunately (and fortunately) we do not have a robust set of data to draw from regarding the mortality rates of Fraxinus latifolia to EAB. The only resource I'm aware of that specifically looked at F. latifolia is linked here: https://research.fs.usda.gov/treesearch/49254

From page 65:
Oregon
ash (F. latifolia Benth.), native to the west coast of
North America, was found to be highly susceptible
in a common garden study conducted in southeast
Michigan (Table 1).

Fraxinus latifolia had among the worst numbers of survival from EAB with 100% of planted OR ash dying. There is talk about F. latifolia developing resistance more quickly than other species because it "lives fast and dies young", giving it the potential for rapid genetic turnover. However, even though it does reproduce at a younger age than other species, the seed is not viable in the seed bank more than 1-2 years, and EAB can, and will, go through entire stands in 3-5 years.

If you'd like to be looped into the EAB task force meetings, let me know. We all just convened yesterday at the OR Invasive Species Council Summit in Hillsboro, but there are monthly Zoom meetings as well.

I hope this helps.

Hi Andy,

Mariah Davis is the one who invited me to attend the EAB task force and EAB survey and monitoring subcommittee meetings and I requested she invite you as well. I'm sorry for the delayed response and the last minute notice, but the meetings for August are tomorrow (Aug 13th). Hopefully you can attend tomorrow, but if not, they are monthly.

As for Fraxinus pennsylvanica and F. americana mortality rates, I would suggest doing a literature review through Google Scholar. In a quick search I found somewhat consistent "nearly 100%" mortality rates by state and study except for a unique green ash grove example quoted in the first bullet point. I'm sure there are more exceptions, but I did not dig deeply.

• "Live trees experienced 58% mortality due to EAB, significantly less than that reported for ash in mixed stands." In this study, they reference near 100% mortality rates of ash in mixed hardwood stands, but less so in thick single species stands of green ash.  read study on F. pennsylvanica from Michigan here

• "EAB was still present in low densities in Michigan and Ohio stands in 2012 where average mortality of ash was nearly 100 %." (F. americana, F. pennsylvanica, F. nigra). Read study here.

• "Long-term forest plot monitoring initiated in 2005, 3 years after the initial detection of EAB in North America, revealed a small number of green ash (0.1–1%) that survive for years after all other surrounding green ash have died (Knight et al., 2012). Although the susceptibility of almost all healthy green ash suggests an absence of defensive capacity against EAB, the persistence of these few “lingering ash” in heavily infested stands suggests that innate defensive responses may be rare rather than absent. Lingering ash have been and continue to be propagated as potential sources of genetic resistance for a United States Forest Service (USFS) breeding research program (Koch et al., 2012, 2015)." Read study here