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A pseudomonad pseudomonas fluorescens producing orange soft rot disease in cacti

A pseudomonad pseudomonas fluorescens producing orange soft rot disease in cacti

Phytopathologische Zeitschrift 103(2): 163-172

A common and destructive cactus disease called "orange soft rot" is described. An atypical strain of P. fluorescens (biotype II of Buchanan and Gibbons 1974; biotype B of Stanier et al. 1966) was isolated from a naturally-infected Neocardenasia herzogiana. This bacterium, which was ultimately isolated from 3 other genera of infected cacti, induced the typical symptoms when injected (2 .times. 107 bacteria/plant) into N. herzogiana, Mammillaria spp., Ferocactus fordii, Weingartia lecoriensis, Cochemiea poselgeri and Pilosocereus sp. Cleistocactus, Cereus and Corryocactus species were immune. These results fit with the pattern observed among naturally-infected cacti. None of the reference bacteria tested (which included Erwinia carnegieana, a known cactus pathogen) induced orange soft rot disease in any of the cacti tested. Although non-fluorescent, this isolate was grouped by the determinative scheme devised by Lelliott et al. (1966) for fluorescent phytopathogenic pseudomonads. Its LOPAT pattern was levan negative oxidase positive, potato rot in group IVb (no representative nomenspecies) although it was atypical in that nitrate was denitrified by this strain.

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Accession: 004613149

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