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ARS Home » Pacific West Area » Parlier, California » San Joaquin Valley Agricultural Sciences Center » Crop Diseases, Pests and Genetics Research » Research » Publications at this Location » Publication #401825

Research Project: Identifying Vulnerabilities in Vector-host-pathogen Interactions of Grapevine and Citrus Pathosystems to Advance Sustainable Management Strategies

Location: Crop Diseases, Pests and Genetics Research

Title: Pest categorisation of Xylella taiwanensis

item BRAGARD, CLAUDE - Catholic University Of Leuven
item BAPTISTA, PAULA - Instituto Politécnico De Bragança (IPB)
item CHATZIVASSILIOU, ELISAVET - Agricultural University Of Athens
item DI SERIO, FRANCESCO - National Council Of Agricultural Research (CRA)
item GONTHIER, PAOLO - University Of Torino
item JAQUES MIRET, JOSEPH ANTON - University Of Jaume
item JUSTESEN, ANNEMARIE - Aarhuis University
item MACLEOD, ALAN - Department For Environment Food And Rural Affairs (DEFRA)
item MAGNUSSON, CHRISTER SVEN - Norwegian University Of Life Sciences
item MILONAS, PANAGIOTIS - Benaki Phytopathological Institute
item NAVAS-CORTES, JUAN - Spanish National Research Council
item PARNELL, STEPHEN - University Of Salford
item POTTING, ROEL - Netherlands Food And Consumer Product Safety Authority
item STEFANI, EMILIO - University Of Modena And Reggio Emilia (UNIMORE)
item THULKE, HANS-HERMANN - Helmholtz Centre For Environmental Research
item VAN DER WERF, WOPKE - Wageningen University
item CIVERA, ANTONIO VICENT - Instituto Valenciano De Investigaciones Agrarias
item YUEN, JONATHAN - Swedish University Of Agricultural Sciences
item ZAPPALA, LUCIA - University Of Catania
item Chen, Jianchi
item MIGHELI, QUIRICO - University Of Sassari
item VLOUTOGLOU, IRENE - Benaki Phytopathological Institute
item STREISSL, FRANZ - European Food Safety Authority
item REIGNAULT, PHILIPPE LUCIEN - French Agency For Food, Environmental And Occupational Health & Safety (ANSES)

Submitted to: European Food Safety Authority (EFSA) Journal
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/25/2023
Publication Date: 1/20/2023
Citation: Bragard, C., Baptista, P., Chatzivassiliou, E., Di Serio, F., Gonthier, P., Jaques Miret, J., Justesen, A.F., MacLeod, A., Magnusson, C., Milonas, P., Navas-Cortes, J.A., Parnell, S., Potting, R., Stefani, E., Thulke, H., Van der Werf, W., Civera, A., Yuen, J., Zappala, L., Chen, J., Migheli, Q., Vloutoglou, I., Streissl, F., Reignault, P. 2023. Pest categorisation of Xylella taiwanensis. European Food Safety Authority (EFSA) Journal. 21(1). Article e07736.

Interpretive Summary: The European Food Safety Authority (EFSA) Plant Health Panel performed a pest categorisation of Xylella taiwanensis, a bacterial pathogen causing pear leaf scorch disease in Taiwan. Dr. J. Chen was invited to participate in panel discussion on the pathogen biology because the pathogen was described by Dr. Chen and colleagues in Taiwan. Currently, the pear pathogen is limited to Taiwan. Yet, the awareness of the pathogen is of importance to pear-growing regions around the world.

Technical Abstract: The EFSA Plant Health Panel performed a pest categorisation of Xylella taiwanensis, a Gram-negative bacterium belonging to the Xanthomonadaceae. The pathogen is a well-defined taxonomic entity, and it is the causal agent of the pear leaf scorch. X. taiwanensis is present in subtropical and temperate areas of the island of Taiwan, where it affects low chilling pear cultivars of the species Pyrus pyrifolia (Asian pear). No other plant species are reported to be affected by the pathogen. The pathogen is not known to be present in the EU territory and it is not included in the Commission Implementing Regulation (EU) 2019/2072. The main pathway for the entry of the pathogen into the EU territory is host plants for planting (except seeds); another possible pathway might be represented by putative insect vectors, though their identity remains unknown. The cultivated area of P. pyrifolia in the EU territory is very limited. Conversely, the genetically related P. communis is widely cultivated in most EU Member States and there is no information so far on the susceptibility of its several cultivars. Should the pest establish in the EU, economic impact is expected, provided that suitable insect vectors are present and P. communis is as susceptible to infection as P. pyrifolia. Phytosanitary measures are available to prevent the introduction and spread of the pathogen into the EU, since plants for planting from Taiwan is a closed pathway; nonetheless, putative vectors, if confirmed and identified, may represent an additional risk of the pathogen’s introduction and spread. The lack of knowledge on whether X. taiwanensis can infect P. communis, the identity and presence of suitable vectors in the EU lead to key uncertainties on entry, establishment, spread and impact. X. taiwanensis satisfies the criteria that are within the remit of EFSA to assess for this species to be regarded as a potential union quarantine pest.