Surveys on Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum in Germany (2004 potato production season)
The NPPO of Germany informed the EPPO Secretariat of the results of official surveys done on potato bacteria during the 2004 production season (earlier surveys were reported in EPPO RS 2003/086). These surveys were done according to EU Council Directives 93/85/EEC for Clavibacter michiganensis subsp. sepedonicus and 98/57/EC for Ralstonia solanacearum.
- Clavibacter michiganensis subsp. sepedonicus (ring rot - A2 list)
During the 2004 production season, 17,856 samples were tested in the laboratory for ring rot. Samples were taken from seed potatoes (11,146 samples), ware potatoes (5,267 samples), gene banks and breeding material, and from potatoes in trade. C. michiganensis subsp. sepedonicus was found in 5 cases in seed potato production, and in 15 cases in ware potatoes. Thorough analyses were carried out to trace back the origin and relationships of infections. As in previous years, control measures according to Council Directive 93/85/EEC were taken. Concerning seed potato production, ring rot situation in 2004 was maintained at a low level compared to previous years. For ware potatoes, situation has continued to improve.
The pest status of C. michiganensis subsp. sepedonicus in Germany is officially declared as: Present in some areas at low prevalence; under eradication.
- Ralstonia solanacearum (brown rot - A2 list)
17,723 samples were tested in the laboratory for R. solanacearum. Samples were taken from seed potatoes (11,151 samples), ware potatoes (5,129 samples), from gene banks and breeding material, and from potatoes in trade. In 5 Federal States, 402 samples were collected from water courses and weed host plants, and tested. Concerning seed potato production, 1 lot was found infected with R. solanacearum, whereas no infection was found in ware potatoes. Thorough analyses were carried out to trace back the origin of infection. Contamination of water courses was found in surface water bodies that had already been found positive in previous years, and in one river for the first time. Control measures according to Council Directive 98/57/EC were taken.
The pest status of R. solanacearum in Germany is officially declared as: Transient, single case; under eradication.
Sources
NPPO of Germany, 2005-07.