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冠瘿病

王洋lily
2018-02-10
  6. 天竺葵根癌病
  又叫冠瘿病,主要发生在天竺葵的根茎处,有的也发生于茎部、分枝处。染病初期可见小瘤状物,而后逐渐扩大变硬,表面龟裂粗糙,灰白色至肉色,大小不一,肿瘤表面往往长出许多毛状物。受害病株矮化,长出的叶片小且常褪绿,开花少,花期短,严重时造成落叶和枝条干枯,甚至全株死亡。该病由根癌土壤杆菌引起,病菌存活于癌瘤表层和土壤中,借助雨水、灌溉水传播,从伤口处侵入,植株土表根茎处易受侵染。连作和根茎处有伤口时发病严重。

  6.1防治方法:
  苗木带菌率高或发现病株时,对苗木茎基部用1%的硫酸铜浸泡5分钟,在移入2%石灰水中浸泡1分钟。发病初期用刀切除病瘤,再用石灰硫 黄合剂或1:1:100倍式波尔多液,25%噻枯唑400~500倍液,90%土链霉素2000~3000倍液涂抹伤口。此外,注射青霉素和链霉素也很有效。
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