Successional Changes in Powdery Mildew Pathogens Prevailing in Common and Wild Tomato Plants Rotation-cultivated in a Greenhouse

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

“…Phylogenetic tree of different powdery mildew species based on the internal transcribed spacer sequence. The newly discovered powdery mildew isolates KTP-05 and KMP-01 belong to the Oidium neolycopersici clade characteristics are similar to those of KTP-03 and KTP-04 (Nonomura et al 2013). The major focus of the present work was to clarify partner plants that could multiply new tomato powdery mildews and transfer them to greenhouse tomatoes.…”

“…These results indicated that colonies forming pseudochains of 1-6 conidia are dominant in our greenhouse tomatoes and that pathogens forming pseudochains of 1-9 conidia newly appeared in this period. Our recent work (Oichi et al 2006;Seifi et al 2012;Nonomura et al 2013) has revealed that the population of powdery mildew pathogens in our greenhouses has changed over the last 5 years. Here, we report the occurrence of the new powdery mildew pathogen (KTP-05).…”

“…During this period, we have attempted to isolate the pathogens infecting various tomato cultivars at different periods of cultivation, to characterise physiological and morphological differences among the isolates, and to identify variation in their virulence to commercial tomato cultivars or wild tomato species and in their host ranges. We obtained some isolates of Oidium neolycopersici from our greenhouses: KTP-01 in 1998 (Kashimoto et al 2003), KTP-02 in 2009(Seifi et al 2012, and KTP-03 and KTP-04 in 2012 (Nonomura et al 2013). In the present paper, we describe the additional isolation of the pathogen KTP-05.…”

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AbstractNonomura 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.

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“…Particular lines of wild tomatoes were available as detector plants to select new isolates. We have also used Solanum habrochaites G1.1560 and S. peruvianum LA2172 to distinguish between KTP-01 and KTP-02 (Seifi et al 2012) and S. arcanum LA1351 and S. hirsutum LA1777 to distinguish between KTP-03 and KTP-04 and among previous isolates (Nonomura et al 2013).…”