On the strain distribution of turnip mosaic virus Pound and Walker (1945)45) attempted to distinguish insect borne viruses or virus strains attacking cruciferous plants. Since then, similar efforts were made by several other workers, mainly in America24,30,62). According to these studies, it was found that there were two distinct Brassica viruses, namely, turnip mosaic virus and cauliflower mosaic virus, and that Brassica crops were often doubly infected with these viruses24).

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... ,47) in Japan also tried to distinguish the viruses that attacked cruciferous crops: Daikon (Japanese radish, Raphanus sativus L. var. hortensis Backer), Chinese cabbage, turnip, Brassica napus, and other related vegetables. As a result of these studies, several aphid borne non-persistent viruses, which affected crucifers in Japan, namely, turnip mosaic virus, cauliflower mosaic virus, and cucumber mosaic virus, were recognized. Cucumber mosaic virus, however, caused Kyushu University,