Other Plant Disease — Japan
Until recently, the only species of potato cyst nematode know to occur in Japan was _Globodera rostochiensis_ (EPPO A2 list). But in August 2015, mature _Globodera_ females and cysts were observed on the roots of potatoes resistant to the Ro1 pathotype of _G. rostochiensis_ in a field in Hokkaido.
Females adhering to potato roots were white or pale yellow, and were clearly distinguishable from _G. rostochiensis_ females, which are brilliant gold. Laboratory analysis (morphology, PCR-RFLP
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