Recent collections of powdery mildews (Erysiphales) in Poland

Findings on the occurrence of 17 species of powdery mildews in Poland and Europe, collected on 37 plant taxa (species, varieties), are reported. Eight species were found on 13 host species not noted in Europe before. 2A species of plants are new hosts for these fungi in Poland. The greatest number of plants (10 species) was infected by Erysiphe berberidis