Zone de Texte: Many thanks to: the diagnosticians of the PPS and of the various Institutes of BBA for their collaboration and patience when filling in and revising the questionnaire Dr. Jens Unger (Head of Department Plant Health) for initiating and promoting these activities Dr. Birgit Schreiber for taking over part of the work Drs. Lesemann, Vetten, Müller, Baufeld, Pietsch, Werres, Schröder, Stachewicz and Moltmann for providing pictures used in this presentation

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