Results of surveys for potato bacteria in Germany (harvest 2002)
The NPPO of Germany recently informed the EPPO Secretariat of the results of the surveys carried out on the 2002 potato harvest for the presence of Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum (both EPPO A2 quarantine pests). Results of the 2001 survey were presented in EPPO RS 2002/143.
- Clavibacter michiganensis subsp. sepedonicus (ring rot)
In the framework of the survey of potatoes during the production season 2002, carried out on the basis of Council Directive 93/85/EEC, 17,049 samples in total were tested in the laboratory for ring rot. Samples were taken from seed potatoes (10,837 samples), ware potatoes (4,920 samples), from gene banks and breeding material, and from potatoes in trade. Thorough analyses were carried out to trace back the origin and relationship of infections. Ring rot was found in 4 cases in seed potato production and in 27 cases in ware potatoes. As in previous years, control measures according to Council Directive 93/85/EEC were taken. As to seed potato production, the ring rot situation has significantly improved in 2002 as to all aspects (number of affected Federal States, places of production, lots and cases) in comparison to that of previous years. This may be attributed to consequently applied harmonized eradication measures and improved mutual information.
Pest status: Present in some areas at low prevalence; under eradication.
- Ralstonia solanacearum (brown rot)
In the framework of the survey of potatoes during the production season 2002, carried out on the basis of Council Directive 98/57/EC, 16,684 samples were tested for brown rot. Samples were taken from seed potatoes (10,837 samples), ware potatoes (4,555 samples), from gene banks and breeding material, and from potatoes in trade. In seven Federal States, in total 146 samples from watercourses were tested for contamination with brown rot. Seed potatoes were not found to be infected with Ralstonia solanacearum. Infection was found in one case in ware potatoes. Thorough analyses were carried out in order to trace back the origin of infection, which could however not be clarified. Contamination of watercourses was found at four sampling sites that had already been found positive during the previous sampling in 2001.
Pest status: transient, single case; under eradication.
NPPO of Germany, 2003-07-10.