| Summary: | In 2016, bacterial canker symptoms, often with dried ooze, were observed on Salix alba
plants in municipal lands and parks in Kerman and Fars provinces, Iran. To determine the
causative agent, samples were collected from symptomatic trees, and macerates of the affected
bark tissues were plated on sucrose nutrient agar (SNA). Ten isolates were identified
by phenotypic characterization, pathogenicity tests, and two of them further confirmed
identity using sequence analysis of the partial of 16S rRNA and gyrB genes, and phylogenetic
analysis. The isolates showed the highest identity (99–100%) with Brenneria salicis. To
our knowledge, this is the first report of watermark disease on S. alba caused by B. salicis
in Iran.
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