346The number of powdery mildew species in Europe is continually increasing due to the invasion of new species from other regions. They spread rapidly and epiphytotically through the new territories parasitizing not only their introduced hosts, but often native plants as well. For example, over the last few decades such North American species as Erysiphe (Microsphaera) azaleae (U. Braun) U. Braun et S. Takam., E. (Uncinula) flexuosa (Peck) U. Braun et S. Takam., East Asian E. arcuata U. Braun, Heluta et S. Takam etc. became common species in Europe, including Ukraine. Erysiphe (Microsphaera) elevata (Burrill) U. Braun et S. Takam. is also an invasive species that was reported on Catalpa Scop. representatives in several
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