New races of the spinach downy mildew pathogen, Peronospora farinosa f. sp. spinaciae, in Japan in 2017
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Six isolates of spinach downy mildew fungus, Peronospora farinosa f. sp. spinaciae, collected from Saitama and Ibaraki Prefectures in 2017 were identified. Three isolates collected from Saitama Prefecture in January differed from all the known races described by the International Seed Federation but their virulence was similar to that of strain UA1014 sampled in the USA in 2014. Isolate Iba17-2, collected from Ibaraki Prefecture in April, was identified as race 10; isolates Iba17-1 and Iba17-3, collected from the same region in February and May, did not match any known races and were coded as novel races, J17-1 and J17-2, respectively.
KeywordsSpinach downy mildew Peronospora farinosa f. sp. spinaciae Race Japan
We thank the USDA Agricultural Research Service and Dr. Diederik Smilde in Naktuinbouw for providing seeds of spinach cultivars for race identification.
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Conflict of interest
The authors declare that they have no conflict of interest.
Human and animal rights
This article does not contain any studies with human participants or animals performed by any of the authors.
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