First report of bacterial root rot of ginseng caused by Pseudomonas aeruginosa in China.
In September 2013, during harvest, suspected bacterial rots were observed on ginseng (Panax ginseng) roots with ∼10% incidence in Fusong County, Jilin Province, China. Rotted roots completely lost their economic value. Symptoms on roots began as water-soaked lesions, and developed rapidly into a soft, watery, decayed mass within 3 to 5 days. The causal agent was identified as P. aeruginosa based on colony morphology, physiological and biochemical tests, sequence analysis of the 16S rRNA gene and pathogenicity test. P. aeruginosa has been reported to cause diseases in a variety of plants including onion, Arabidopsis and sweet basil. This is thought to be the first report of P. aeruginosa causing ginseng root rot in China.