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First report of the downy mildew Peronospora lamii on Salvia officinalis and Rosmarinus officinalis in the UK

2008; Wiley; Volume: 57; Issue: 2 Linguagem: Inglês

10.1111/j.1365-3059.2007.01654.x

1365-3059

D. R. HUMPHREYS‐JONES, A. V. Barnes, Charles R. Lane,

Yeasts and Rust Fungi Studies

Plant PathologyVolume 57, Issue 2 p. 372-372 Free Access First report of the downy mildew Peronospora lamii on Salvia officinalis and Rosmarinus officinalis in the UK D. R. Humphreys-Jones, D. R. Humphreys-Jones Consultant Plant Pathologist, 25 Juniper Drive, Ely, Cambridgeshire, CB7 4TT; andSearch for more papers by this authorA. V. Barnes, A. V. Barnes Central Science Laboratory, Sand Hutton, York, YO41 1LZ, UKSearch for more papers by this authorC. R. Lane, C. R. Lane Central Science Laboratory, Sand Hutton, York, YO41 1LZ, UK E-mail c.lane@csl.gov.uk.Search for more papers by this author D. R. Humphreys-Jones, D. R. Humphreys-Jones Consultant Plant Pathologist, 25 Juniper Drive, Ely, Cambridgeshire, CB7 4TT; andSearch for more papers by this authorA. V. Barnes, A. V. Barnes Central Science Laboratory, Sand Hutton, York, YO41 1LZ, UKSearch for more papers by this authorC. R. Lane, C. R. Lane Central Science Laboratory, Sand Hutton, York, YO41 1LZ, UK E-mail c.lane@csl.gov.uk.Search for more papers by this author First published: 19 March 2008 https://doi.org/10.1111/j.1365-3059.2007.01654.xCitations: 6 AboutSectionsPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat In May 2004 samples of Salvia officinalis and its variegated form S. officinalis cv. Icterinia with downy mildew were received from a herb-propagating nursery based in the south of England. Both cultivars were grown under protection, in a cool, damp polythene tunnel. The infection first appeared as pale green patches on the upper surfaces of the leaves, that later became yellowish and then brown. A dense layer of dingy, purple-coloured sporangiophores, with ovoid to ellipsoid sporangia (mostly 20–24 × 17–18 µm), were found on the lower leaf surface below the brown patches. Thick-walled golden yellow oospores (mostly 30–38 µm) developed between veins on some dead leaves. Specimens and photographs of both infected cultivars were sent to CABI Biosciences at Egham, Surrey where Dr JC David confirmed the identification as Peronospora lamii. Isolates from Salvia officinalis (IMI392138) and S. officinalis cv. Icterinia (IMI392139) were added to the reference collection. In October 2005 the same pathogen was found affecting Salvia sp. and Rosmarinus officinalis (rosemary) grown under cover on a commercial herb-production nursery in southern England. The pathogen was causing a severe foliar blight with a profuse downy growth on the under leaf surface. Sporangia were ovoid to ellipsoid with a mean diameter of 21·7 to 18·3 µm (17·5–25 µm × 17·5–23 µm), again conforming to the published description of P. lamii (Francis, 1981). Peronospora lamii has a broad host range affecting several members of the Lamiaceae (Francis & Waterhouse 1988; Preece, 2002) but there are no UK records on S. officinalis or R. officinalis. The pathogen has been intercepted on a number of occasions on Salvia spp., but mainly on sage from Israel and not on Rosmarinus. The mildew at times has been very damaging, with up to 90% of plants infected preventing harvesting of the crop. Due to the presence of the organism in the UK no statutory action was warranted. This is the first record of P. lamii causing damage to sage (S. officinalis) and rosemary (R. officinalis) in the UK. Acknowledgements The authors wish to thanks Dr JC David of the Royal Horticultural Society, Wisley, UK (formerly at CABI Bioscience UK) for assistance in identifications on sage and Mr Terry Thorpe for photographic work. References Francis SM, 1981. Peronospora lamii. CMI Descriptions of Pathogenic Fungi and Bacteria Number 688. Egham, UK: CABI Biosciences. Google Scholar Francis SM, Waterhouse G, 1988. List of the Peronosporaceae reported from the British Isles. Transactions of the British Mycological Society 91, 1– 62. CrossrefWeb of Science®Google Scholar Preece TF, 2002. A Checklist of the Downy Mildews (Peronosporaceae) of the British Isles. Kew, UK: British Mycological Society. Google Scholar Citing Literature Volume57, Issue2April 2008Pages 372-372 ReferencesRelatedInformation