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Distribution of clubroot disease of a cruciferous weed, Cardamine flexuosa, in major isolated islands, Hokkaido and Okinawa in Japan

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An Erratum to this article was published on 13 December 2006


To investigate the distribution of clubroot of a cruciferous weed, Cardamine flexuosa, caused by Plasmodiophora brassicae, field surveys were conducted in Hokkaido, Aomori, and Okinawa, and major isolated islands in Japan during 1993–2004. The disease was newly recorded in Aomori and nine islands in five different prefectures, including Sado (Niigata), Oki (Shimane), Mishima (Yamaguchi), Tsushima, Iki and Goto (Nagasaki), and Koshiki, Yakushima, and Tanegashima (Kagoshima). The diseased plants were not found in Hokkaido and Okinawa (islands of Okinawa, Kumejima, Ishigaki, Iriomote, and Kohama). However, inoculation tests showed that most C. flexuosa collected from Hokkaido and Okinawa included many susceptible plants. The result suggests that resistance of the plants is not the reason that the disease was not found in these areas.

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Correspondence to Shuhei Tanaka.

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Tanaka, S., Mizui, Y., Terasaki, H. et al. Distribution of clubroot disease of a cruciferous weed, Cardamine flexuosa, in major isolated islands, Hokkaido and Okinawa in Japan. Mycoscience 47, 72–77 (2006).

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