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Four statements questioning the EU control strategy against Xylella fastidiosa

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Bragard, Claude [UCL] Caffier, David [INRA] Candresse, Thierry [High Council for biotechnology] Chatzivassiliou, Elisavet [Agricultural University of Athens, Department of Crop Science, Plant Pathology Laboratory] Dehnen-Schmutz, Katharina [Coventry University, UK, Centre for Agroecology, Water and Resilience (CAWR)] Jacques Miret, Josep Anton [UCL] Winter, Stephan [Plant Virus Department, German Collection of Microorganisms and Cell Cultures, DSMZ GmbH]

This opinion addresses questions concerning the EU control strategy against Xylella fastidiosa: i) factors affecting symptom expression and spread of X. fastidiosa; ii) the aetiology of the CoDiRO (Complesso del Disseccamento Rapido dell’Olivo) disease; iii) host plant removal as an option for containment or eradication; and iv) secondary effects of pesticides. Xylella fastidiosa subsp. pauca was shown to be the causal agent of the CoDiRO disease of olives by recent biological assays fulfilling Koch’s postulates. Symptoms in X. fastidiosa infected plants develop because of wilting from water stress induced by bacteria clogging the xylem vessels. Therefore, interventions supporting vigorous growth and development of the plant may improve its health status, its resilience, prolong its productive phase and extend the symptomless phase of the disease. The Panel considers removal of infected plants, in a system-based approach, as the only option to prevent further spread of the pathogen to new areas. In the outer strip of the containment area bordering the buffer zone, removal of infected plants and stringent monitoring can be effective in preventing pathogen spread into the buffer zone. In areas of recent introduction, such as new outbreaks in the buffer zone, the stringent removal of both infected plants and all host plants irrespective of their health status within a radius, as described in current EU legislation, can be effective in reducing pathogen spread, when rigorously administered and new infections are detected in time. Finally, the reduction of vector populations by application of chemical or biological means, mechanical treatments, or other sustainable methods, can have effects in slowing down the pathogen spread. Concerning the use of pesticides, there is currently no evidence of negative effects of such treatments on the interaction of X. fastidiosa with infected olive trees, the severity of symptoms and the outcome of the infection.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2016
Language Anglais
Journal information "EFSA Journal" - Vol. 14, no.3, p. 1-24 (2016)
Peer reviewed yes
Publisher European Food Safety Authority (EFSA), Parma
issn 1831-4732
Publication status Publié
Affiliation UCL - SST/ELI/ELIM - Applied Microbiology
Keywords CoDiRO strain ; containment ; eradication ; Koch’s postulate ; pesticides ; soil ; symptoms expression ; 3135
Links
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Bibliographic reference Bragard, Claude ; Caffier, David ; Candresse, Thierry ; Chatzivassiliou, Elisavet ; Dehnen-Schmutz, Katharina ; et. al. Four statements questioning the EU control strategy against Xylella fastidiosa. In: EFSA Journal, Vol. 14, no.3, p. 1-24 (2016)
Permanent URL http://hdl.handle.net/2078.1/186596