# Council Directive 93/85/EEC of 4 October 1993 on the control of potato ring rot, Division 4.4.2

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

Observe for bright fluorescing cells with characteristic morphology of C. m. subsp. sepedonicus in the test windows of the test slides (see web site http://forum.europa.eu.int/Public/irc/sanco/Home/main). The fluorescence intensity must be equivalent or better to the positive control strain at the same antibody dilution. Cells with incomplete staining or with weak fluorescence must be disregarded.
If any contamination is suspected the test must be repeated. This may be the case when all slides in a batch show positive cells due to the contamination of buffer or if positive cells are found (outside of the slide windows) on the slide coating.

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Source: https://www.legislation.gov.uk/eudr/1993/85/annex/I/division/4/division/4.4/division/4.4.2 (the official version)
Page: https://openlegislation.uk/eu-directive-1993-85/annex-I/division-4/division-4.4/division-4.4.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.