[F1Principle: U.K.
The testing procedure is intended for detection of latent infections in potato tubers. A positive result from at least two screening tests ( 3 ), 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 R. solanacearum 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 detection of 10 3 to 10 4 cells/ml of resuspended pellet, included as positive controls in each series of tests.]
