ジャガイモの新萎黄病について

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In the summer of 1961, potato plants (var. Benimaru) naturally infected with a yellows-type virus disease were found from three different regions of Hokkaido. The affected potato plants were stunted, prcduced chlorotic axiollary shoots which had an upright habit, and the younger leaflets were dwarf showing marginal chlorosis and downward cupping. Tomato plants grafted with the affected potato scions produced chlorotic and slender apical shoots having yelllowish leaflets about two weeks after inoculation. In the advanced stage of infection the axillary growth was promoted and the petioles grew long forming arches. The symptoms of potato and tomato plants, produced by this new disease are different from those produced by potato witches' broom and other yellows-type diseases of potato found in Japan. Therefore, the authors name this new disease "Potato yellows typeIII" to distinguish it from types I and II which have been classifled by Oshima in 1960. Type I is a strain of aster yellows virus. Top grafting of the affected tomato scions were made using 14 species in 5 genera of Sola-naceous plants as stock plants. Eleven species of them showed obvious symptoms and most of the symptoms were readily distinguishable from the symptoms which were produced by the other yellows-type diseases, but some of them resembled each other in the certain stages of infection. The most characteristic symptoms were observed in Nicotiana glutinosa and N. tabacum var. Samsun, in which this new disease produced narrow dwarf apical leaves curving downward and could be clearly distinguished from potato witches' broom and aster yellows (Type I). N. glauca showed no symptoms, but was proved to be a symptomless carrier by the results of return inoculation. Both potato witches' broom and aster yellows viruses were carried in this species without producing syrnptoms. The disease could not be transmitted from tomato to petunia by graft inoculatiop, although the scions continued to grow on the stock plants for a long time. Transmissian to petunia was successful if infected Datura plants were used as scions. Physalis floridana and Capsicum annuum produced no symptoms, but no subinoculations were tried using these plants as inocula.
日本植物病理学会の論文
1964-01-31

ジャガイモの新萎黄病について

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