Information on the distribution of a new invasive powdery mildew, Erysiphe macleayae R.Y. Zheng et G.Q. Chen, parasitising Chelidonium majus L. and Macleaya microcarpa Fedde (Papaveraceae) in Ukraine, is provided. The fungus was first found in 2007 in Crimea, and subsequently in other regions, i.e. Cherkasy, Kherson, Khmelnytsky, and Odessa oblasts, as well as in the cities of Kiev and Odessa. For the last seven years, this powdery mildew has been recorded annually in Kiev. Experimental infection of Ch. majus with a fungus from M. microcarpa was successful. Anamorphs of E. macleayae and E. cruciferarum Opiz ex L. Junell, parasitising Glaucium corniculatum (L.) J. Rudolph (also Papaveraceae) in Ukraine, were compared. It has been found that the former has longer conidia and conidiophores.
Full text: PDF (Ukr) 2.07M