Abstract
<i>Corylus avellana</i> (common hazel) is an economically important plant worldwide, including Poland, especially for its fruits, i.e., hazelnuts. In addition to the hitherto commonly occurring fungal species <i>Phyllactinia guttata</i>, another species, i.e. <i>Erysiphe corylacearum</i>, has recently been found in Poland. In the summer of 2018, hazel leaves with symptoms of powdery mildew were first observed and collected in Lublin (Poland). The fungus was identified based on its morphological characteristics and analyses of DNA sequences of the internal transcribed spacer (ITS) and (LSU) regions of the ribosomal DNA. This is the first report of this invasive Asian fungus in Poland.
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