Erysiphales and their hyperparasite, Ampelomyces quisqualis, of the Drawsko Landscape Park, Poland

Results of 3-year investigations of the occurrence of fungi of the order Erysiphales and their hyperparasite, Ampelomyces quisqualis in the Drawsko Landscape Park (N-Poland) are presented. Among the fungi found, 26 species belonging to 7 genera were identified. Many of the causal agents of the powdery mildews revealed were previously rarely found in Poland. Microsphaera vanbruntiana var. sambuci-racemosae parasitizing Sombucus nigra is a fungus new to the Mycota of Poland. Ampelomyces quisqualis was found associated with Mirosphaera symphoricarpi colonizing Symphoricarpos albus and with Sphaerotheca mors-uvae parasitizing Ribes nigrum; these powdery mildew fungi are fungal hosts of A. qulsqualis not recorded in the literature to date