Symptoms of cluster rot of grape caused by Dothiorella sp.

DOI JASI Web Site 16 References
  • INOUE K.
    Agricultural Experiment Station, Okayama Prefectural General Agriculture Center
  • ONO T.
    Agricultural Experiment Station, Okayama Prefectural General Agriculture Center
  • NASU H.
    Agricultural Experiment Station, Okayama Prefectural General Agriculture Center

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Other Title
  • Ｄｏｔｈｉｏｒｅｌｌａ　ｓｐ．によるブドウ房枯病の症状
  • Dothiorella sp ニ ヨル ブドウ ボウコビョウ ノ ショウジョウ

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Description

Leaf blight, shoot blight and cluster rot of grape in plastic houses and glasshouses were found in Okayama Prefecture in 1996. Leaf blight caused leaves to droop after the petiole base had browned, mainly in short pruning culture. Shoot blight occurred mainly in long pruning culture. These symptoms developed more frequently in the plastic house, especially with early forcing. The symptoms on fruit clusters were of two types, cluster rot and dry rot. The isolates of Dothiorella sp. isolated from these lesions at a high frequency were pathogenic on petioles, fruit clusters and berries of grape. Thus, leaf blight, shoot blight and cluster rot were the same disease. The name cluster rot (Fusagare-byo in Japanese) was proposed for the disease.

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