Abstract
AbstractIn 2014, bark cankers were observed on Caucasian alder (Alnus subcordata) trees in Iran. The disease was characterized by a dark watery liquid often exuding from longitudinal cankers in the bark of the tree trunks which stained the surface. Symptomatic tissue fromA. subcordatawas sampled from a number of sites in the Mazandaran province. Isolations were performed on nutrient agar supplemented with sucrose (SNA) and yielded bacterial colonies that were uniform, round and whitish. The bacterial strains isolated from alder trees in Iran were similar toBrenneria alnibased on phenotypic and genotypic (nucleotide sequences of the 16S rRNA, and housekeeping genesgyrB, andinfB) characteristics. The pathogenicity of the representative strains was determined by inoculating stem pieces ofA. subcordata. All tested strains caused longitudinal necrotic lesions 30 days after inoculation and were re‐isolated from this tissue. To our knowledge, this is the first report of the occurrence ofB. alniin Iran, and onA. subcordataglobally.
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