Mycological Progress

, Volume 11, Issue 2, pp 351–359 | Cite as

A new species of Pustula (Oomycetes, Albuginales) is the causal agent of sunflower white rust

  • Christoph Rost
  • Marco Thines
Original Article


White blister rust of sunflower is an emerging disease that is among the most important diseases in this crop in South Africa and has recently spread to Europe. For the genus Albugo, it has been demonstrated that species are mostly at least host genus specific and that several previously overlooked species are present on Brassicaceae. It thus seems likely that previously unrecognised species are also present in the genus Pustula. Based on previous phylogenetic reconstruction in combination with differences in oospore ornamentation, it is revealed that Pustula on sunflower, previously attributed to Pustula tragopogonis (syn. Albugo tragopogonis), is distinct from Pustula on Tragopogon. Therefore, this pathogen is described as a new species, Pustula helianthicola. In addition, taxonomic observations revealed that Pustula tragopogonis is an incorrect name and is replaced by the new combination, Pustula obtusata.


Albuginaceae Albugo tragopogonis Helianthus annuus Morphology Oospores 



M.T. designed the study, C.H.R. performed microscopic investigations and analyses including photographs and drawings, while M.T. and C.H.R. carried out the taxonomic analyses and wrote the manuscript. We are indebted to the curators of the Herbaria DAR and VPRI for the kind loan of herbarium specimens in their keeping, and to the curators of G and L for allowing access to the specimens of A.P. De Candolle and H. Persoon, respectively. This study was supported by grants from the Elite Program for Postdocs of the Landesstiftung Baden-Württemberg, awarded to M.T. The present study was financially supported by the research funding programme "LOEWE - Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz" of Hesse's Ministry of Higher Education, Research, and the Arts.


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Copyright information

© German Mycological Society and Springer 2011

Authors and Affiliations

  1. 1.Institute of Botany 210University of HohenheimStuttgartGermany
  2. 2.Biodiversity and Climate Research CentreFrankfurtGermany
  3. 3.Department of Biological Sciences, Institute of Ecology, Evolution and DiversityGoethe UniversityFrankfurtGermany

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