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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 (20.degree. C .+-. 5.degree. 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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McPherson, G.M.; Preece, T.F., 1978: Bacterial blight of Pelargonium: movement, symptom production and distribution of Xanthomonas pelargonii (Brown) Starr & Burkholder in Pelargonium X hortorum Bailey, following artifical inoculation. The quantitative distribution of virulent and avirulent X. pelargonii and Serratia marcescens in a susceptible cv. (Paul Crampel) was examined and symptom development recorded. The virulent form of X. pelargonii moved rapidly, well in advance of s...

Knauss, J.F.; Tammen, J., 1967: Resistance of Pelargonium to Xanthomonas pelargonii. A wide range of resistance to Xanthomonas pelargonii was found among 22 species and 4 hybrids of Pelargonium. Stem-inoculated plants fell into 3 distinct groups: highly resistant (e.g., P. X domesticum), intermediate resistance or susceptibility (...

Monachon, Pa, 1977: Bacteriosis of Pelargonium caused by Xanthomonas pelargonii. Revue horticole suisse: 50 (10) 357-362

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Wainwright, S.H.; Nelson, P.E., 1972: Histopathology of Pelargonium species infected with Xanthomonas pelargonii. The bacterium spread in a similar manner in susceptible, moderately resistant and resistant spp. of Pelargonium, initially moving throughout the plant in the xylem and subsequently to the laterally adjoining parenchyma. The relative numbers of the...

Griesbach, E.; Olbricht, K., 2002: Resistance to Xanthomonas hortorum pv. pelargonii in the genus Pelargonium. A wide range of Pelargonium cultivars, species and hybrids of different sections were examined for resistance to X. hortorum pv. pelargonii. All tested cultivars of Pelargonium-Zonale-Hybrids were susceptible in different degree. Only one tetraplo...