Better News Regarding Fringetrees and EAB
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Collapse ▲A 2015/2016 study of 166 white fringetrees (Chionanthus virginicus) growing in landscapes in Pennsylvania, Ohio, Indiana and Illinois (Peterson and Cipollini) indicated that emerald ash borers (EAB) were able to infest this species in addition to their normal ash (Fraxinus spp.) hosts. This study raised great concerns about the future of white fringetrees in landscapes and in the wild. A follow up study by Ellison, Peterson and Cipollini provides a more hopeful outlook.
According to a March 2020 article in Entomology Today, white fringetrees are expected to be able to withstand attacks by EAB. In this later study, it was observed that some attacked trees did not survive and others declined in health. However, trees that weren’t re-infested were able to recover. One important characteristic of landscape plantings as compared with native populations is that, as noted by Cipollini, “Ornamental trees tend to be small and planted in low density situations”. EAB is more likely to be attracted to and sustained by larger trees in denser stands, as would be the case with wild populations. Overall, it is expected that ” … this species will meet a better fate than most ash trees native to eastern North America.”
As for the connection between ash trees and fringetrees, both genera are members of the Oleaceae or olive family. A cultivated olive, Olea europaea, has also been confirmed as a suitable host for EAB.
White fringetree in springtime, New Bern, NC.