New data on the expansion of Erysiphe platani (Howe) U. Braun & S. Takam. (Erysiphales, Ascomycota) in Ukraine
Purpose: Monitoring of phytopathology condition of plane trees (Platanus L.) in the cities of Kyiv and Zhytomyr.
Methods: The samples for the investigation have been selected in the course of route investigation of plants in parks, public gardens, and street plantations of plane trees in Kyiv and Zhytomyr. Phytopathology analysis and morphometry of conidia and fruit bodies and asci of Erysiphe platani were carried out with the help of a light microscope and a smartphone with the software "Magnifier Cam".
Results: For the first time, the affection of leaves of plants genus Platanus L. by powdery mildew Erysiphe platani has been detected in the most northern region of Ukraine (50°26'34 N; 30°32'56 E). The fungus went through the full development cycle, with the formation of mycelium, conidia, and cleistothecia. A comparative analysis of morphometric parameters of conidia and cleistothecia of Erysiphe platani sampled by other authors and researchers has been conducted.
Conclusions: The affection of Platanus x acerifolia plants by powdery mildew Erysiphe platani has been observed only in certain localities in Kyiv, where the host plant grows. Several types of affection have been identified: complete coverage of the upper surface of a mature leaf which does not cause its deformation; the formation of a densely felted mold on young apical leaves and deformation of the leaf blade; damage to the Lammas leaves of plants (second half of August).