Ash Trees (Fraxinus spp.) in Urban Greenery as Possible Invasion Gates of Non-Native Phyllactinia Species

Two Phyllactinia species have been associated with powdery mildew on leaves of ash trees (Fraxinus) in Eurasia, fraxinicola U. Braun & H.D. Shin from Southeast Asia and fraxini (DC.) Fuss Europe. Non-native are planted urban greeneries both Europe Asia, but so far, the two not reported same area. Our molecular analysis European material consisting 55 specimens 15 countries confirmed absence P. In Europe, we all three native introduced Asian species, Fraxinus. chinensis ssp. Rhynchophylla (Hance) A.E. Murray Fraxinus mandshurica Rupr, arboreta. Among 11 collections examined 3 were identified as 8 fraxinicola. The environmental niches do show significant overlap multidimensional space defined by bioclimatic variables. This suggests that is adapted to conditions prevailing most does represent an invasive threat across continent. Models potential distribution there some areas northwest could be susceptible invasion