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

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

Detection of R. solanacearum in surface water is most reliable during late spring, summer and autumn seasons when water temperatures exceed 15 °C.
Repeated sampling at different times in the above mentioned period at designated sampling points will increase the reliability of detection by reducing the effects of climatic variation.
Take into account the effects of heavy rainfall and the geography of the watercourse to avoid extensive dilution effects that may obscure presence of the pathogen.
Take surface water samples in the vicinity of host plants if these hosts are present.

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Source: https://www.legislation.gov.uk/eudr/1998/57/annex/II/section/IV/division/2/division/2.1/division/1/annotation/1 (the official version)
Page: https://openlegislation.uk/eu-directive-1998-57/annex-II/section-IV/division-2/division-2.1/division-1/annotation/1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.