Occurrence of bacterial vein rot of grape in Nagasaki prefecture [Japan]
2004
Morita, A. (Nagasaki Prefectural Agricultural Coll., Isahaya (Japan))
Field surveys revealed that an average 5.0% of grape plants, mainly cv. 'Kyoho', showed the symptoms of vein rot in the vineyards in Nagasaki Prefecture. The symptoms were observed most frequently in non-heated greenhouses and were rare in heated greenhouses or in the fields. The symptoms did not affect the fruit quality and yield of 'Kyoho' but diseased leaves fell earlier than healthy ones did. A bacterium, which formed milky white and round colonies, was isolated from vein rot lesions on 'Kyoho'. The bacterium induced the similar symptoms when it was inoculated into the veins of pre-hardening leaves of 'Kyoho'. The results showed that bacterium was the causal agent of the vein rot symptoms of 'Kyoho'.
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