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Council Directive 98/57/EC of 20 July 1998 on the control of Ralstonia solanacearum (Smith) Yabuuchi et al.
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The standard sample size is 200 tubers per test. More intensive sampling requires more tests on samples of this size. Larger numbers of tubers in the sample will lead to inhibition or difficult interpretation of the results. However, the procedure can be conveniently applied for samples with less than 200 tubers where fewer tubers are available.
Validation of all detection methods described below is based on testing of samples of 200 tubers.
The potato extract described below can also be used for detection of the potato ring rot bacterium, Clavibacter michiganensis subsp. sepedonicus .
Optional pre-treatment in advance to sample preparation:
Incubation of samples at 25 to 30 °C, for up to two weeks before testing, to encourage multiplication of any R. solanacearum populations.
Wash the tubers. Use appropriate disinfectants (chlorine compounds when PCR-test is to be used in order to remove pathogen DNA) and detergents between each sample. Air dry the tubers. This washing procedure is particularly useful (but not required) for samples with excess soil and if a PCR-test or direct isolation procedure is to be performed.
Note: Set aside any (rotting) tubers with suspected brown rot symptoms and test separately. U.K.
If during removal of the heel end core suspect symptoms of brown rot are observed, a visual inspection of this tuber should be done and the tuber cut near the heel end. Any cut tuber with suspected symptoms should be kept for at least two days at room temperature in order to allow suberisation and stored refrigerated (at 4 to 10 °C) under proper quarantine conditions. All tubers including those with suspicioussymptoms should be kept according to Annex III.
Process the heel end cores by one of the following procedures: either,
Cover the cores with sufficient volume (approximately 40 ml) of extraction buffer (Appendix 4) and agitate on a rotary shaker (50-100 rpm) for 4 hours below 24 °C or for 16 to 24 hours refrigerated,
or
Homogenise the cores with sufficient volume (approximately 40 ml) of extraction buffer (Appendix 4), either in a blender (e.g. Waring or Ultra Thurax) or by crushing in a sealed disposable maceration bag (e.g. Stomacher or Bioreba strong guage polythene, 150 mm × 250 mm; radiation sterilised) using a rubber mallet or suitable grinding apparatus (e.g. Homex).
Note: The risk of cross-contamination of samples is high when samples are homogenized using a blender. Take precautions to avoid aerosol generation or spillage during the extraction process. Ensure that freshly sterilised blender blades and vessels are used for each sample. If the PCR test is to be used, avoid carry-over of DNA on containers or grinding apparatus. Crushing in disposable bags and use of disposable tubes is recommended where PCR is to be used. U.K.
Repeated freezing and thawing is not advisable.
If transport of the extract is required, ensure delivery in a cool box within 24 to 48 hours.
See Flow chart and description of the tests and optimised protocols in the relevant appendices:
Selective isolation (see Section VI.A.4.)
IF test (see Section VI.A.5.)
PCR tests (see Section VI.A.6.)
FISH test (see Section VI.A.7.)
ELISA tests (see Section VI.A.8.)
Bioassay (see Section VI.A.9.)]
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