Surveys on Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum in Germany: 1999 harvest
The German NPPO informed the EPPO Secretariat of the results of the regular surveys on Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum (both EPPO A2 quarantine pests) carried out in Germany for the 1999 potato harvest.
Clavibacter michiganensis subsp. sepedonicus
In total, 18.091 samples were tested for the presence of the bacterium (12.174 samples of seed potatoes, 326 samples from gene banks and breeding material, 1.020 samples of traded potato material, and 4.571 samples of ware and industrial potatoes). In addition to laboratory testing, visual inspections were performed on cut tubers.
As a result, C. michiganensis subsp. sepedonicus was found in 16 samples of seed potatoes and 41 samples of ware and industrial potatoes. The situation of C. michiganensis subsp. sepedonicus in Germany can be described as follows: Present: only in some areas.
Ralstonia solanacearum
In total, 16.561 samples were tested in the laboratory for the presence of the bacterium (11.871 samples of seed potatoes, and 4.690 samples of ware and industrial potatoes). Infection was found in a limited area in 2 growers, on a total of 11 plots. This low occurrence probably results from the introduction of infected planting material from outside Germany. Therefore, the NPPO of Germany assumed that R. solanacearum is not established in Germany. The situation of R. solanacearum in Germany can be described as follows: Present: at very low prevalence, under eradication.
Control measures against both bacteria were applied in accordance with EU Directives 93/85/EEC and 98/57/EC. Surveys were continued on the 2000 harvest with the same intensity, but the final results are not yet available.
Sources
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NPPO of Germany, 2001-02.
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