Skip to Main Content
Phytophthora obscura sp. nov., a new species of the novel Phytophthora subclade 8dAuthor(s): N. J. Grünwald; S. Werres; E. M. Goss; C. R. Taylor; V. J. Fieland
Source: Plant Pathology. 61(3):610-622
Publication Series: Scientific Journal (JRNL)
View PDF (919.35 KB)
DescriptionA new Phytophthora species was detected (i) in the USA, infecting foliage of Kalmia latifolia, (ii) in substrate underneath Pieris, and (iii) in Germany in soil samples underneath Aesculus hippocastanum showing disease symptoms. The new species Phytophthora obscura sp. nov. is formally named based on phylogenetic analysis, host range, Koch's postulates and morphology. Phytophthora obscura is homothallic with paragynous antheridia and semipapillate sporangia. It is genetically closely related to P. syringae and P. austrocedrae and together these three species define a new Phytophthora subclade 8d, with significant support for all genetic loci analysed including seven nuclear genes and the mitochondrial gene coxII. The morphological and ecological characteristics are very similar to P. syringae, and it is likely that P. obscura was not described earlier because it was identified as P. syringae. Artificial inoculations indicated that horse chestnut, kalmia, pieris and rhododendron might be hosts, and Koch’s postulates were confirmed for kalmia from which it was isolated. This pathogen was named after its elusive nature since it has to date rarely been detected in the US and Germany.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationGrünwald, N. J.; Werres, S.; Goss, E. M.; Taylor, C. R.; Fieland, V. J. 2012. Phytophthora obscura sp. nov., a new species of the novel Phytophthora subclade 8d. Plant Pathology. 61(3):610-622. doi: 10.1111/j.1365-3059.2011.02538.x
KeywordsAesculus hippocastanum, Kalmia latifolia, oomycete, Pieris, Rhododendron, taxonomy
- Estimated smoldering probability: a new tool for predicting ground fire in the organic soils on the North Carolina Coastal Plain
- Chopper herbicide site preparation for different bedding timings and vegetation complexes in North Florida
- Potential Natural Vegetation Group: Palmetto Prairie
XML: View XML