Clubroot disease was found on wasabi (Eutrema wasabi Maxim.) growing in drained paddy fields in Yamaguchi Prefecture.The clubroot incidence was high in wasabi plants transplanted from one of two nursery beds set in drained paddy fields, where the occurrence of clubroot on Cardamine flexuosa With., a cruciferous weed, was more frequently observed. In the inoculation test, the clubroot fungus from the weed showed high pathogenicity to wasabi as well as that from Chinese cabbage. It is suggested that the fungus from the weed affects wasabi in fields.
Southern blight of garlic caused by Corticium rolfsii has been observed in the experimental field of Vegetable and Ornamental Crops Research Station in Mie Prefecture since 1976. This report is the first record of the occurrence of this disease in Honshu of Japan.
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