Natural woody plant, Mallotus japonicus, as an ecological partner to transfer different pathotypic conidia of Oidium neolycopersici to greenhouse tomatoes

https://doi.org/10.17221/24/2013-PPSCitation:Nonomura T., Matsuda Y., Yamashita S., Akahoshi H., Takikawa Y., Kakutani K., Toyoda H. (2013): Natural woody plant, Mallotus japonicus, as an ecological partner to transfer different pathotypic conidia of Oidium neolycopersici to greenhouse tomatoes. Plant Protect. Sci., 49: S33-S40.
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In our routine surveys for the powdery mildew disease in greenhouse tomatoes, we detected a new pathogen that forms pseudochains consisting of 12 conidia. To identify the original plant that dispersed this pathogen, wild plants infected with powdery mildew were monitored. The pathogen on Japanese mallotus, Mallotus japonicus, produced a similar type of pseudochain, and conidia were infectious to tomatoes. Inversely, the conidia on the tomato leaves infected M. japonicus. Infectivity assays and internal transcribed spacer (ITS)-based phylogenetic analyses indicated that the two pathogens on the tomato and M. japonicus were identical. These results suggest that the conidia on M. japonicus can be transmitted to greenhouse tomatoes. This work documents the ecological transmission of conidia between wild plants and greenhouse tomatoes
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