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Deliberate and malevolent use of plant pathogens, i.e. agroterrorism lato sensu (anticrop bioterrorism and use of bioweapons against the agricultural sector), may represent a non-negligible threat for crops and forests in Europe. In order to assess this risk objectively, a methodology based on a critical review of existing Pest Risk Analysis schemes has been elaborated and is described in the present paper. In this methodology, three interdependent steps are suggested: (i) definition of an a priori list of potentially dangerous plant pathogens for Europe, (ii) detailed elaboration and analysis of theoretical scenarios of possible acts of agroterrorism, and (iii) elaboration and use of a risk assessment scheme adapted to agroterrorism. [ABSTRACT FROM AUTHOR]