Gesunde Pflanzen (2000) 52, 240-247

Dorthee Abdel-Kader, Luitgardis Seigner and M. Zellner (2000)
Epidemiologische Feldstudien über die bakterielle Ringfäule (Clavibacter michiganensis spp. sepedonicus) und die Schleimkrankheit (Ralstonia solanacearum) der Kartoffel
[Epidemiological field studies on bacterial ring rot (Clavibacter michiganensis spp. sepedonicus) and brown rot (Ralstonia solanacearum) of potato]
Gesunde Pflanzen 52 (7-8), 240-247
Abstract: Epidemiology of bacterial ring rot (Clavibacter michiganensis ssp. sepedonicus (Cms)) and brown rot (Ralstonia solanacearum (Rs)) was investigated after stem and tuber inoculation of Agria potato plants and by cultivation of the progeny in a field trial in 1998 and 1999. Infections of stems and tubers were determined by PCR (polymerase chain reaction) and IF (immunofluorescence)-test. The investigations aimed at getting information about the epidemiology of both organisms under Bavarian climate and soil conditions using a commonly grown potato cultivar. In a long-term view the results should contribute to assess the measures taken by EU Plant Health Authorities to avoid dissemination of both diseases.
Inoculated potato plants showed no symptoms, but developed a high degree of latent infection in tubers and stems which was up to 100% within Rs-inoculated plants. Latent infections in Cms -inoculated plants were much lower but depended on the Cms strains tested. Cultivation of the progeny of the Rs-inoculated plants resulted in a strong decrease of infection which showed not only a lower number of infected plants but also a decreased percentage of infected tubers. Nevertheless the heavy break-down of the infection level must not lead to a general underestimation of the risk which comes from the cultivation of latent infected potatoes. Our results demonstrate, that e. g. the change of the bacterial strain used for inoculation was sufficient to generate a totally different infection level. The studies show, that the epidemiology of both organisms depends on many different factors and therefore should be investigated further in long-term studies before making any predictions.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Database assignments for author(s): Luitgardis Seigner

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Clavibacter sepedonicus	Potato (Solanum tuberosum)
	Ralstonia solanacearum	Potato (Solanum tuberosum)