Pest categorisation of Melampsora medusae
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Other documents of the author: Jeger, Michael; Bragard, Claude; Caffier, David; Candresse, Thierry; CHATZIVASSILIOU, ELISAVET; Dehnen-Schmutz, Katharina; Gilioli, Gianni; Grégoire, Jean-Claude; Jaques , Josep A.; MacLeod, Alan; Navajas Navarro, María; Niere, Björn; parnell, stephen; Potting, Roel; Rafoss, Trond; Rossi, Vittorio; Urek, Gregor; van Bruggen, Ariena; van der Werf, Wopke; West, Jonathan; Winter, Stephan; Boberg, Johanna; Gonthier, Paolo; Pautasso, Marco
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comunitat-uji-handle2:10234/2508
comunitat-uji-handle3:10234/6999
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Title
Pest categorisation of Melampsora medusaeAuthor (s)
Date
2019-07-10Publisher
European Food Safe Authority (EFSA)Bibliographic citation
JEGER, Michael; BRAGARD, Claude; CAFFIER, David; CANDRESSE, Thierry; CHATZIVASSILIOU, Elisavet; DEHNEN-SCHMUTZ, Katharina; GILIOLI, Gianni; GRÉGOIRE, Jean-Claude; JAQUES, Josep A.; MACLEOD, Alan; NAVAJAS NAVARRO, María; NIERE, Björn; PARNELL, Stephen; POTTING, Roel; RAFOSS, Trond; ROSSI, Vittorio; UREK, Gregor; VAN BRUGGEN, Ariena; VAN DER WERF, Wopke; WEST, Jonathan; WINTER, Stephan; BOBERG, Johanna; GONTHIER, Paolo; PAUTASSO, Marco (2019). Pest categorisation of Melampsora medusae. EFSA Journal, v. 16, n. 7Type
info:eu-repo/semantics/articlePublisher version
EFSA Journal (2019), v. 16. n. 7Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Following a request from the European Commission, the EFSA Plant Health Panel performed a pest
categorisation of Melampsora medusae, a well-defined and distinguishable fungal species of the family
Melampsoraceae. ... [+]
Following a request from the European Commission, the EFSA Plant Health Panel performed a pest
categorisation of Melampsora medusae, a well-defined and distinguishable fungal species of the family
Melampsoraceae. The pathogen is regulated in Annex IAI of Council Directive 2000/29/EC as a harmful
organism whose introduction into the EU is banned. M. medusae is a heteroecious rust fungus with
Populus spp. as primary telial hosts and various conifers (Larix, Pinus, Pseudotsuga, Abies, Picea and
Tsuga spp.) as secondary aecial hosts. M. medusae is native to North America and has spread to
South America, Africa, Asia, Oceania, as well as the EU, where M. medusae f. sp. deltoidae has been
reported with a restricted distribution and low impacts from Belgium, south-west France and southern
Portugal. The pest could spread to other EU countries, via dissemination of spores, movement of host
plants for planting and cut branches. Climate is assumed not to be a limiting factor for the
establishment of the pathogen in the EU. M. medusae is the most widespread and important
Melampsora rust in North America. In western Canada, extensive damage has been reported to
conifers and Populus spp. in nurseries and plantations as well as in woodlands. M. medusae is
damaging in both Australia and New Zealand. The pest could have economic and environmental
impacts in the EU if aggressive isolates of M. medusae were introduced into the EU. Import prohibition
of host plants for planting is an available measure to reduce the risk of further introductions. Some
resistant Populus cultivars are available. Moreover, increasing the genetic diversity of poplar plantations
can prevent disease impacts. The main uncertainty concerns the factors explaining the low
pathogenicity of the populations of M. medusae present in the EU. The criteria assessed by the
Panel for consideration as a potential quarantine pest are met (the pest is present, but with a
restricted distribution, and is officially under control). Given that plants for planting are not the main
pathway of spread, not all criteria for consideration as a regulated non-quarantine pest are met. [-]
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