A new disease, bacterial fruit rot of jujube, caused by Xanthomonas arboricola in Korea.
A fruit rot of jujube (Zizyphus jujuba [Ziziphus jujuba]) was observed in fields in the Boeun District and in Kyungsan City, Korea, in 2008 and 2009. Initial symptoms on fruit included small, circular reddish to black spots which turned deep brown to red brown as they expanded. The surface of affected areas eventually became sunken, while internal tissues turned deep brown. Based on morphological characteristics, pathogenicity tests and nucleotide sequence data, the causal agent was identified as X. arboricola. This is thought to be the first report of bacterial fruit rot of jujube caused by X. arboricola. Further studies are required to determine the pathovar status of the strain. Nucleotide sequence data are available under the following GenBank Accession Nos.: GU120086, GU120087 and GU120085 for gyrB of isolates BC2927, BC2928 and BC3042, respectively.