European Journal of Plant Pathology

, Volume 145, Issue 1, pp 81–87 | Cite as

Molecular identification and pathogenicity assessment of a rust fungus infecting common ragweed (Ambrosia artemisiifolia) in its native North American range

  • Edit Kassai-Jáger
  • Marion K. Seier
  • Harry C. Evans
  • Levente Kiss


A rust fungus collected from common ragweed (Ambrosia artemisiifolia) in Texas, USA, was identified as belonging to the Puccinia xanthii morphospecies based on its nrDNA ITS sequence. Pathogenicity studies carried out with this rust accession under quarantine conditions in the UK showed that the fungus was highly virulent on A. artemisiifolia plants from Australia. Recently, P. xanthii has been proposed as a potential classical biological control agent (CBCA) for common ragweed in its invasive range, focusing on Europe, despite previous doubts about its biocontrol potential. The results of the pathogenicity tests reported here support the suitability of this pathogen as a CBCA for common ragweed.


Allergenic weed Classical biological control Fungal species concept Pucciniaceae Pucciniomycetes Invasive alien species 



We thank W. A. (Bill) Palmer (Queensland Department of Lands) for sending herbarium material of the North American rust. We acknowledge the support of the EU COST Action FA1203 ‘Sustainable management of Ambrosia artemisiifolia in Europe (SMARTER)’.


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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2015

Authors and Affiliations

  • Edit Kassai-Jáger
    • 1
    • 2
  • Marion K. Seier
    • 3
  • Harry C. Evans
    • 3
  • Levente Kiss
    • 1
  1. 1.Plant Protection Institute, Centre for Agricultural ResearchHungarian Academy of Sciences (MTA-ATK)BudapestHungary
  2. 2.Faculty of Health Sciences, Department of EpidemiologySemmelweis UniversityBudapestHungary
  3. 3.CABI Europe-UKSurreyUK

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