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Evidence of epiphyllous latency of xanthomonas pelargonii in pelargonium






Annales de Phytopathologie 10(1): 61-66

Evidence of epiphyllous latency of xanthomonas pelargonii in pelargonium

The bacterial disease caused by X. pelargonii is characterized by periods of decreasing disease effects, sometimes up to disappearance of symptoms. A detection and count technique for bacteria living on the leaves surfaces was perfected by using immunofluorescence. Inoculum development on Pelargonium leaves surfaces could be observed for several months. With a low inoculum level, the bacteria can survive on the leaf surfaces for > 2 mo. on the symptomless host plant. An approximate concentration of 103 bacteria/leaf cm2 is needed and has to be kept at least 30 days (20.degree. C .+-. 5.degree. C, high hygrometry) so that leaf spots can appear.


Accession: 005411391



Related references

Digat, B., 1978: Demonstration of epiphyllous latency of Xanthomonas pelargonii (Brown) Starr & Burkholder in Pelargonium. Inoculum on the leaf surface was observed for several months by an immunofluorescence technique. With little inoculum bacteria could remain on the leaf surface for at least 2 months without producing symptoms. Under the experimental conditions c....

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