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Scientific Opinion on the risk to plant health posed by Phialophora cinerescens (Wollenweber) van Beyma for the EU territory, with the identification and evaluation of risk reduction options

on the Wiley Online Library

Metadata

Panel members at the time of adoption

Richard Baker, Claude Bragard, Thierry Candresse, Gianni Gilioli, Jean-Claude Grégoire, Imre Holb, Michael John Jeger, Olia Evtimova Karadjova, Christer Magnusson, David Makowski, Charles Manceau, Maria Navajas, Trond Rafoss, Vittorio Rossi, Jan Schans, Gritta Schrader, Gregor Urek, Johan Coert van Lenteren, Irene Vloutoglou, Stephan Winter and Wopke van der Werf

Abstract

The Panel on Plant Health conducted a pest risk assessment for Phialophora cinerescens (Wollenweber) van Beyma (the causal agent of Phialophora carnation wilt) for the EU territory, identified risk management options and evaluated their effectiveness. The risk assessment was conducted taking into account current EU legislation. The Panel also provided an opinion on the effectiveness of the present EU requirements against this organism, listed in Council Directive 2000/29/EC. Four pathways for entry were identified. Plants for propagation (rooted and unrooted cuttings of host plants) were considered as a major pathway. Entry via this pathway was rated as unlikely because of the effective disease prevention techniques for cuttings now in place in places of production. P. cinerescens has been found in most Member States but with few occurrences or restricted distribution. In some Member States the pest was eradicated. Owing to current cultural practices and control measures, establishment in areas in which the pest was not previously present is considered very unlikely. For the same reasons, the probability of infection of crops is strongly reduced and hence the probability of spread to areas where the pest was not previously present is very unlikely. Similarly, the impact on carnation is at the moment minimal and unlikely to increase in the future. Risk reduction options to reduce the probability of entry and spread and mitigate the impact were evaluated; those addressing the phytosanitary status of the propagation material were considered to be the most effective and feasible (e.g., the officially accepted carnation certification system for source planting material), including the current regulations laid down in Council Directive 2000/29/EC. If the current regulation were removed, a certification system could be just as effective as the existing regulation, provided it included practically all the prescriptions of the present regulation.

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