2001 surveys on Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum in Germany
The NPPO of Germany recently provided the situation of Clavibacter michiganensis subsp. sepedonicus and Ralstonia solanacearum (both EPPO A2 quarantine pests) based on the results of the 2001 surveys.
- Clavibacter michiganensis subsp. sepedonicus
A survey on potato ring rot was carried out during the 2001 production period, on the basis of EU Council Directive 93/85/EEC. In total, 16,985 samples were tested in the laboratory for ring rot. Samples were taken from seed potatoes (11,321 samples), ware potatoes (4,578 samples), gene banks, breeding material and potatoes in trade. Thorough analyses were carried out to trace back the origin and relationship of infections. Ring rot was found in 11 cases in seed potato production and in 27 cases in ware potatoes. As in previous years, control measures according to EU Council Directive 93/85/EEC were taken. The ring rot situation in Germany has significantly improved in 2001 in all respects (affected number of Federal States, places of production, lots and cases) in comparison to previous years. This may be attributed to the systematic application of eradication measures and improvement of mutual information.
The NPPO of Germany declares the pest status of C. michiganensis subsp. sepedonicus as: Present in some areas at low prevalence, under eradication.
- Ralstonia solanacearum
A survey on potato brown rot was carried out during the 2001 production period, on the basis of EU Council Directive 98/57/EC. In total, 16,859 samples were tested for brown rot. Samples were taken from seed potatoes (11,144 samples), ware potatoes (4,629 samples), gene banks, breeding material and from potatoes in trade. In four Federal States, 51 samples of Solanum dulcamara and water from rivers were tested for brown rot. Seed potatoes were not found infected by R. solanacearum. Infection was found in four cases in ware potatoes. Thorough analyses were carried out in order to trace back the origin of infection, which could not be clarified in three of these cases. In one case, the source of infection was most probably contaminated surface water used for irrigation.
The NPPO of Germany declares the pest status of Ralstonia solanacearum as: Transient, single cases; under eradication.
Sources
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NPPO of Germany, 2002-08.
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