EUROPEAN AND MEDITERRANEAN PLANT PROTECTION ORGANIZATION ORGANISATION EUROPEENNE ET MEDITERRANEENNE POUR LA PROTECTION DES PLANTES 15-21058 Pest Risk Analysis for Thousand cankers disease (Geosmithia morbida and Pityophthorus juglandis) September 2015 EPPO 21 Boulevard Richard Lenoir 75011 Paris www.eppo.int [email protected] This risk assessment follows the EPPO Standard PM PM 5/5(1) Decision-Support Scheme for an Express Pest Risk Analysis (available at http://archives.eppo.int/EPPOStandards/pra.htm) and uses the terminology defined in ISPM 5 Glossary of Phytosanitary Terms (available at https://www.ippc.int/index.php). This document was first elaborated by an Expert Working Group and then reviewed by the Panel on Phytosanitary Measures and if relevant other EPPO bodies. Cite this document as: EPPO (2015) Pest risk analysis for Thousand cankers disease (Geosmithia morbida and Pityophthorus juglandis). EPPO, Paris. Available at http://www.eppo.int/QUARANTINE/Pest_Risk_Analysis/PRA_intro.htm Photo Superficial cankers caused by Geosmithia morbida on Juglans nigra and insect holes (Pityophthorus juglandis). Courtesy: Prof. Lucio Montecchio, Universita di Padova, IT. 15-21058 (15-20694, 15-20353 14-20219 14-20142 14-19823, 14-19733) Pest Risk Analysis for Thousand cankers disease (Geosmithia morbida and Pityophthorus juglandis) This PRA follows EPPO Standard PM 5/5 Decision-Support Scheme for an Express Pest Risk Analysis. PRA area: EPPO region Prepared by: Expert Working Group on Thousand cankers disease Date: 2014-08-26/29. Composition of the Expert Working Group (EWG) CRANSHAW Whitney (Mr) Colorado State University, Department of Bioagricultural Sciences and Pest Management, 80523 Fort Collins, Colorado, United States Tel: +1-9704916781 - [email protected] GRÉGOIRE Jean-Claude (Mr) Université Libre de Bruxelles, 50 av. FD Roosevelt, 1050 Bruxelles, Belgium Tel: +32-26503179 - [email protected] MAYFIELD Albert (Mr) USDA Forest Service, Southern Research Station, 200 W.T. Weaver Blvd., NC 28804 Asheville, United States Tel: +1-8282574358 - [email protected] MONTECCHIO Lucio (Mr) Università di Padova, Sezione di Patologia vegetale del Dipartimento Territorio e Sistemi Agro-Forestali, c/o Agropolis, Viale dell'Universita, 16, Legnaro, I-35020 Padova, Italy Tel: +39-0498272883 - [email protected] SAURAT Carole (Ms) ANSES, Laboratoire de la Santé des Végétaux, Domaine de Pixérécourt, Bât. E., 54220 Malzéville, France Tel: +33-383290099 - [email protected] VETTORAZZO Marco (Mr) Phytosanitary Service of Veneto region, Venice Office, Via Longhena 6, 30175 Marghera-Venezia, Italy Tel: +39-0412795700 - [email protected] PETTER Françoise (Ms) OEPP/EPPO, 21 boulevard Richard Lenoir, 75011 Paris, France GROUSSET Fabienne (Ms) Tel: +33-145207794 - [email protected]; [email protected] The PRA was further reviewed by core members (José Maria Guitian Castrillon, Salla Hannunen, Roel Potting, Robert Steffek, Arild Sletten, Nursten Üstün, Dirk Jan van der Gaag) between 2014-12-18 and 2015- 01-20, and by the Panel on Phytosanitary Measures and the Panel on Quarantine Pests for Forestry on 2015- 03-11/13. 1 Summary of the Express Pest Risk Analysis for thousands canker disease PRA area: EPPO region Endangered area: P. juglandis and G. morbida have the potential to establish throughout the EPPO region where Juglans species occur. They are likely to be more damaging (more generations of P. juglandis) in the Southern and Eastern parts of the EPPO region, where walnuts are also grown more widely. Main conclusions Overall assessment of risk: The likelihood of entry is estimated as high, especially on wood (with or without bark) of Juglans and Pterocarya and untreated wood packaging material. Plants for planting are also a very suitable entry pathway, if there is a trade. Establishment is likely where Juglans is grown in the EPPO region, and there is no factor that would limit the spread until the entire endangered area is colonized. The EWG considered that the potential impact in the absence of phytosanitary measures would be high in the long term. Phytosanitary Measures: Risk management options were determined for wood of Juglans and Pterocarya, particle wood and waste wood of deciduous species, and plants for planting of Juglans and Pterocarya. Wood packaging material should be treated according to ISPM 15. Scion wood of Juglans and bark of Juglans and Pterocarya were considered together with, respectively, plants for planting and particle wood and waste wood. Containment measures are in place in Veneto, Italy (Regione del Veneto, 2014a,b, 2015). Phytosanitary risk for the endangered area (Individual ratings for likelihood of entry and establishment, and for High x Moderate ☐ Low ☐ magnitude of spread and impact are provided in the document) Level of uncertainty of assessment (see Q 17 for the justification of the rating. Individual ratings High ☐ Moderate x Low ☐ of uncertainty of entry, establishment, spread and impact are provided in the document) Other recommendations: Given that the pests have been found in Italy (Veneto and Lombardia), and that several commodities that may carry the pest are imported (especially from the USA), more extensive surveys in other areas of Italy and the EPPO region would be useful. Survey and trapping may be considered in EPPO countries, even more intensively in those countries importing large quantities of walnut wood and wood chips from the USA. In particular, trapping could be performed at points of entry (e.g. ports) and facilities (e.g. mills) receiving Juglans wood and plants, and in areas where Juglans are grown close to such facilities. Finally, there are gaps in the knowledge about these pests, and research on their biology and management is critical to developing better management measures (including susceptibility trials including hybrids, better detection and monitoring tools, cultural controls, chemical and biological control). However there is no doubt that they can establish in most of the EPPO region where Juglans are present and have the potential to cause damage. 2 Content Stage 1. Initiation ..................................................................................................................................................................................... 4 Stage 2. Pest risk assessment ................................................................................................................................................................ 4 1. Taxonomy ................................................................................................................................................................................... 4 2. Pest overview .............................................................................................................................................................................. 5 3. Is the pest a vector? .................................................................................................................................................................... 5 4. Is a vector needed for pest entry or spread? .............................................................................................................................. 6 5. Regulatory status of the pest ...................................................................................................................................................... 6 6. Distribution .................................................................................................................................................................................. 6 7. Host plants and their distribution in the PRA area ...................................................................................................................... 9 8. Pathways for entry .................................................................................................................................................................... 11 8.1 Possible pathways ........................................................................................................................................................ 12 Wood of Juglans and Pterocarya from countries where P. juglandis or G. morbida occurs ......................................... 12 Wood packaging material (including dunnage) ............................................................................................................. 14 Natural spread .............................................................................................................................................................. 14 Plants for planting (including scion wood) of Juglans and Pterocarya from countries where P. juglandis or G. morbida occurs. .......................................................................................................................................................................... 15 Particle wood and waste wood of deciduous species from countries where P. juglandis or G. morbida occurs .......... 16 Bark of Juglans and Pterocarya from countries where P. juglandis or G. morbida occurs ........................................... 17 8.2 Pathways considered very unlikely, not considered further .......................................................................................... 18 8.3 Pathways not judged possible, not considered further ................................................................................................. 18 8.4 Conclusion ...................................................................................................................................................................