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Viruses causing apple topworking disease (Taka tsugi byo) in Japan

, : Viruses causing apple topworking disease (Taka tsugi byo) in Japan. Acta Horticulturae (44): 221-229

A general decline of apple trees often followed top grafting with any of several new apple cvs, especially where Malus prunifolia var. ringo was the rootstock but it also occurred sometimes where M. sieboldi or M. sieboldi var. arborescens was the stock. Indexing tests showed apple chlorotic leaf spot (CLSV) to be present in all declined and many apparently healthy trees, while stem pitting (SPV) and stem grooving (SGV) viruses were sometimes present.

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