Article Ash Trees (Fraxinus spp.) in Urban Greenery as Possible Invasion Gates of Non-Native Phyllactinia Species Katarína Pastirˇcáková 1 , Katarína Adamˇcíková 1 , Kamila Bacigálová 2, Miroslav Cabo ˇn 2 , Petra Mikušová 2 , Dušan Senko 2, Marek Svitok 3,4 and Slavomír Adamˇcík 2,* 1 Department of Plant Pathology and Mycology, Institute of Forest Ecology, Slovak Academy of Sciences, Akademická 2, SK-94901 Nitra, Slovakia;
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[email protected]; Tel.: +421-37-694-3130 Abstract: Two Phyllactinia species have been associated with powdery mildew on leaves of ash trees (Fraxinus) in Eurasia, Phyllactinia fraxinicola U. Braun & H.D. Shin from Southeast Asia and Phyllactinia fraxini (DC.) Fuss from Europe. Non-native ash trees are planted in urban greeneries in both Europe and Southeast Asia, but so far, the two Phyllactinia species have not been reported from the same area. Our molecular analysis of European material consisting of 55 Phyllactinia specimens from 15 countries confirmed the absence of P.