Bacterial soft rot of Oncidium orchids caused by a Dickeya sp. (Pectobacterium chrysanthemi) in Florida.
In August 2008, approximately 50 Oncidium 'Gower Ramsey' orchids were discovered at a commercial orchid nursery in South Florida (USA) with brown, macerated leaves typical of soft rot disease reported in other orchids. Based on biochemical characteristics, nucleotide sequence analysis, and pathogenicity tests, the causal agent was identified as P. chrysanthemi. An Erwinia sp. has been reported to cause soft rot symptoms on Oncidium aureum. This is thought to be the first report of a Dickeya sp. (=P. chrysanthemi) causing soft rot symptoms on Oncidium orchids grown in large-scale commercial production in the United States.