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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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