@ARTICLE{TreeBASE2Ref18441, author = {Marco Thines and Sabine Telle and Sebastian Ploch and Fabian Runge}, title = {Identity of the downy mildew pathogens of basil, coleus, and sage with implications for quarantine measures}, year = {2009}, keywords = {}, doi = {10.1016/j.mycres.2008.12.005}, url = {}, pmid = {}, journal = {Mycological Research}, volume = {113}, number = {5}, pages = {532--540}, abstract = {The downy mildew pathogen of basil (Ocimum spp.) has caused considerable damage throughout the past five years, and an end to the epidemics is not in sight. The downy mildew of coleus (Solenostemon spp.) is just emerging and here we report that it was very recently introduced into Germany. Although it has been recognised that these pathogens are a major threat, the identity of the pathogens is still unresolved, and so it is difficult to devise quarantine measures against them. Using morphological comparison and molecular phylogenetic reconstructions we confirmed in this study that the downy mildews of basil and coleus are unrelated to Peronospora lamii, which is a common pathogen of the weed Lamium purpureum. In addition, we conclude by the investigation of the type specimen of P. swingleii and downy mildew specimens on Salvia officinalis that the newly occurring pathogens are not identical to P. swingleii on Salvia reflexa. The taxonomy of the downy mildew pathogens of hosts from the Lamiaceae and, in particular, from the tribes Mentheae and Elsholtzieae, is discussed, and a new species is described to accommodate the downy mildew pathogen of basil and coleus, which is the first downy mildew pathogen known to be parasitic to hosts of the tribe Ocimeae.} }

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