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Evidence of epiphyllous latency of xanthomonas pelargonii in pelargonium

, : Evidence of epiphyllous latency of xanthomonas pelargonii in pelargonium. Annales de Phytopathologie 10(1): 61-66

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 ( C .+-. C, high hygrometry) so that leaf spots can appear.

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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....

Hammerschlag, F.; Bottino, P.1; Stewart, R., 1982: Effect of culture filtrates of Xanthomonas campestris pv. pelargonii and extracts of geranium stems inoculated with Xanthomonas campestris pv. pelargonii on geranium callus and seedlings Bacterial blight, Pelargonium X hortorum. Plant cell tissue and organ culture(4): 247-254

Arsenijevic M., 1988: Xanthomonas campestris pathovar pelargonii brown 1923 dye 1978 a parasite of pelargonium pelargonium hortorum bailey. Bacterial rot of the stem and wilting of plants is a frequent disease of the pelargonium in Yugoslavia. From the diseased plants have been isolated several isolates of bacteria, whose pathogenic and bacteriological characteristics are set forth in...

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