| Summary: | A total of 103 tree and shrub samples infected with powdery mildew were collected during 2002–2019 from locations within parks, botanical gardens and urban green areas within the Czech Republic and the powdery mildews were morphologically analyzed and identified. The most frequently represented genera were: <i>Erysiphe</i> (27, including former genera <i>Microsphaera</i> and <i>Uncinula</i>), <i>Podosphaera</i> (11, including former genus <i>Sphaerotheca</i>), <i>Phyllactinia</i> (3), <i>Sawadaea</i> (2) and <i>Arthrocladiella</i> (1). New records for the Czech Republic were: <i>E. (U.) arcuata</i>, <i>E. (M.) deutziae</i>, <i>E. (M.) euonymicola</i>, <i>E. (U.) flexuosa</i>, <i>E. (M.) platani</i>, <i>E. (M.) symphoricarpi</i>, <i>E. (M.) vanbruntiana</i> var. <i>sambuci-racemosae</i>, <i>E. (U.) ulmi</i>, <i>Po. amelanchieris</i>, <i>Po.</i> (<i>Sph.</i>) <i>pruinosa</i> and <i>Po.</i> (<i>Sph.</i>) <i>spiraeae</i>. The results were compared with the spectrum of powdery mildew species in the surrounding countries (Slovakia; Hungary; Poland and Germany (Bavaria)).
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