It was suggested by Kevin that PCR is routinely
used in the EC (EU) for testing for Psol (brown
rot) and Cms (ring rot) in potato. Although I am
aware that PCR methodologies exist for both these
bacterial pathogens, I do not believe that they have
been implemented for routine use. They have only
been used experimentally to confirm diagnoses
based on serological tests, as far as I know.
Perhaps we could hear from the labs that are
actually using PCR for these pathogens.
Thanks, Solke