Abstract
Leaves of purple buckthorn observed with powdery mildew symptoms were collected from the district Abbottabad, Khyber- Pakhtunkhwa, Pakistan during field tours from August to October between 2017-2021. Morpho-anatomical features and molecular phylogenetic analysis were used to identify the causal agent as Erysiphe friesii var. dahurica. Pathogenicity was confirmed on healthy leaves of Rhamnus purpurea in a glasshouse at 25°C with 75 to 80% humidity and after inoculation, white powdery colonies appeared after 7 to 10 days. The fungal colonies were checked for the confirmation of pathogen. Erysiphe friesii var. dahurica on R. purpurea is being described here as a new record for Pakistan and Rhamnus purpurea is a new host, reported for the first time.
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