@ARTICLE{TreeBASE2Ref16130, author = {Levente Kiss and Susumu Takamatsu and James H. Cunnington}, title = {Molecular identification of Oidium neolycopersici as the causal agent of the recent tomato powdery mildew epidemics in North America}, year = {2004}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Plant Disease}, volume = {}, number = {}, pages = {}, abstract = {A previous morphological study of Oidium anamorphs responsible for the recent tomato powdery mildew outbreaks worldwide suggested that, despite controversial data in the literature, these epidemics were caused solely by a newly erected species, O. neolycopersici, in North America. We report here the first molecular evidence that the North American anamorphs belong, indeed, to O. neolycopersici. The ITS sequences of the North American anamorphs determined in this study were identical with those determined for three Japanese and two European specimens of O. neolycopersici and differed from the ITS sequences of two other European specimens in only one base in the ITS2 region. A morphological study confirmed that all the North American Oidium anamorphs included in this study produced conidia singly similar to O. neolycopersici. They were readily distinguished from O. lycopersici which produces conidia in chains and it is known to infect tomato only in Australia. The phylogenetic analysis showed that O. neolycopersici is a distinct powdery mildew species, and it is neither identical nor closely related to an anamorph of a known polyphagous species of the Erysiphaceae. Apparently, it was introduced to the USA and Canada only in the 1990s, but its origin is still unknown.} }

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