Powdery mildew on greengage (Prunus domestica subsp. italica var. claudiana) detected in Iran

In November 2015, white, powdery colonies were found on leaves of greengage ( Prunus domestica subsp. italica var. claudiana ) in the Meshginshahr (Ardabil province) and Khoy (West Azarbaijan province) regions of Iran. The circular colonies with chasmothecia scattered throughout were present mainly on the upper surface of the leaves. The fungus associated with the white colonies was identified as Podosphaera tridactyla using morphological and molecular characteristics. This paper details the first record of a powdery mildew on greengage in Iran.