Vascular disease

Japanese: 導管病 - どうかんびょう（英語表記）vascular disease

A plant disease in which the pathogen grows exclusively in xylem vessels, causing impaired conduction. The accumulated pathogen, polysaccharides secreted by the pathogen, and decomposed plant tissues block the xylem vessels, causing the stems and leaves to wilt and die. Fusarium oxysporum (an imperfect fungus) causes vascular diseases in many plants, including tomato wilt, fusarium wilt in cucumbers, watermelons, melons, and sweet potatoes, and yellows in radishes, cabbage, and strawberries. When the roots or stems of diseased plants are cut, browning of the xylem vessels is easily observed.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

病原がもっぱら導管で増殖して通導障害を起こす植物の病気。増殖した病原，病原から分泌された多糖類，植物組織の分解物などが蓄積して導管が閉塞し，茎葉がしおれて枯れる。Fusarium oxysporum(不完全菌)はトマト萎（いちよう）病，キュウリ，スイカ，メロン，サツマイモのつる割れ病，ダイコン，キャベツ，イチゴの萎黄病など多くの植物に導管病を起こす。発病株の根や茎を切断すると導管部の褐変が容易に観察される。

出典　株式会社平凡社世界大百科事典第２版について　情報

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