# Council Directive 93/85/EEC of 4 October 1993 on the control of potato ring rot, Division: Principle

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

The testing procedure is intended for detection of latent infections in potato tubers. A positive result from at least two screening tests, based on different biological principles, must be complemented by the isolation of the pathogen; followed by, in case of isolation of typical colonies, confirmation of a pure culture as C. m. subsp. sepedonicus . A positive result from only one of the screening tests is not sufficient to consider the sample suspect.
Screening tests and isolation tests must permit a detection threshold of 10 3 to 10 4 cells/ml resuspended pellet, included as positive controls in each series of tests.

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Source: https://www.legislation.gov.uk/eudr/1993/85/annex/I/division/1/division/1.2/division/1 (the official version)
Page: https://openlegislation.uk/eu-directive-1993-85/annex-I/division-1/division-1.2/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.