A novel bacterium has been found that causes a soft rot disease of , the cultivated mushroom. It has been characterized using nutritional, physiological, chemical and molecular techniques. Based on these data, it was shown to have many characteristics in common with members of the genus . Despite similarities to the only described species within this genus, , there were a number of differences between the mushroom pathogen isolated and this species. Despite the high degree of genotypic similarity between members of the genus and , as evidenced by DNA-RNA hybridization, and the high degree of 16S rDNA sequence similarity between members of the genera and , as well as the generically misnamed , it was possible to show that members of the genus could be easily distinguished from these taxa. The data also indicated that the mushroom pathogenic strains represent a novel species within the genus for which the name sp. nov. is proposed. The type strain of this species has been deposited in the Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Braunschweig, Germany, as DSM 9628 and at the National Collection of Plantpathogenic bacteria, UK, as NCPPB 3945. To aid practical control of the disease, the effect of the relative humidity on symptom expression on was determined.


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