At 7 w.a.t, 50% roots samples detect R.solanacearum positive, roots black necrosis plant incidence increase rapidly, while stem show no obvious symptom.

 
  • 移栽后第7周根部样品青枯菌检出率达到50%25左右、根部黑色坏死发病率开始快速上升,茎部无明显症状;
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