ネギ黒渋病に関する研究(1) : 本病の発生状況と病原菌の生理

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タイトル別名
  • Studies on Black Leaf Blight of Welsh Onion, Allium fistulosum. I. Conditions of Disease Occurrence and Certain Biological Characteristics of the Causal Fungus.
  • ネギ黒渋病に関する研究　　Ｉ．　本病の発生状況と病原菌の生理
  • ネギ クロシブビョウ ニカンスルケンキュウ 1 ホンビョウ ノ ハッセイ ジ
  • I. Conditions of Disease Occurrence and Certain Biological Characteristics of the Causal Fungus
  • I. 本病の発生状況と病原菌の生理

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Etiological and biological studies were carried out on the causal fungus of black leaf blight of Welsh onion, causing severe damage on Welsh onion, which is cropped continuously using home-grown seeds. The disease was observed in the fields of Shimonita-cho, Gunma prefecture, as well as in the northern part of the Kanto District including Shimonita-cho, the Tohoku District and Hokkaido, but is scarcely observed in southern part of Kanto District and western Japan. Symptoms appearing on Welsh onion inoculated with a mycelial mat of the fungus or with naturally matured ascospores were similar to those developed under natural infection. On all diseased lesions originating from both natural infection and artificial inoculation, only the perfect state was observed. The optimum temperature for growth of the fungus on PDA was about 20°C, and 20-25°C for the maturation of asci and germination of ascospores. The pH range for fungal growth was from 4 to 9, with the optimum from 6 to 9.

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