Fraxinus ornus
So far the fungus has mainly affected the European ash ("Fraxinus excelsior") and its cultivars, but it is also known to attack the Narrow-leafed ash ("Fraxinus angustifolia"). The Manna ash ("Fraxinus ornus") is also a known host, although it is less susceptible than the other European ash species. Experiments in Estonia have shown that several North American ash species are susceptible, especially the Black ash ("Fraxinus nigra"), and to a lesser extent the Green ash ("Fraxinus pennsylvanica"). The White ash ("Fraxinus americana") and the Asian species known as Manchurian ash ("Fraxinus mandschurica") showed only minor symptoms in the study.