Surveys on Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum
The results of surveys carried out for Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum (both EPPO A2 quarantine pests) in Germany on the potato harvest 1998 are presented below.
- Clavibacter michiganensis subsp. sepedonicus
16,551 potato samples were tested (12,352 seed potatoes – 4,199 ware potatoes). 15 positive cases were found in seed potato samples and 38 in ware potato samples. Compared to 1997, the situation has improved as a result of the phytosanitary measures which are applied to control the disease. All production areas where the disease has been found are placed under strict official control. Present: only in some areas.
- Ralstonia solanacearum
14.896 potato samples were tested (11,164 seed potatoes – 3,732 ware potatoes). Only two positive seed potato samples were detected. One sample corresponded to an old potato cultivar which is now no longer used. Further analysis to trace possible sources of infection failed to detect further infection. This bacterium is considered as under eradication in Germany. Present: at very low prevalence, under eradication.
Sources
NPPO of Germany, 2000-02.