# Council Directive 98/57/EC of 20 July 1998 on the control of Ralstonia solanacearum (Smith) Yabuuchi et al., Division

Extent: E+W+S+N.I.

As positive controls, prepare decimal dilutions from a suspension of 10 6 cfu per ml of a virulent biovar 2 strain of R. solanacearum (e.g. NCPPB 4156 = PD 2762 = CFBP 3857). To avoid any possibility of contamination, prepare positive controls totally separately from samples to be tested.
For each newly prepared batch of a selective medium its suitability for growth of the pathogen should be tested before it is used to test routine samples.
Test control material in an identical manner as the sample(s).

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Source: https://www.legislation.gov.uk/eudr/1998/57/annex/II/section/VI/division/A/division/4/division/4.1/division/1 (the official version)
Page: https://openlegislation.uk/eu-directive-1998-57/annex-II/section-VI/division-A/division-4/division-4.1/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.