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猝倒病在烟叶3片真叶前发生较重。发病初期,近地面处茎基部呈褐色水渍状腐烂,病苗似开水烫过一样,呈暗绿色。发病后期,发病苗床内幼苗常成片倒伏死亡。病菌随雨水或灌溉水传播。此病在24℃以下的温度和苗床湿度大时易发病;排水不良以及降雨过多,有利病害的发生。有效防
Damp down disease occurs in the leaf before the true leaves heavier. Early onset, near the ground at the base of the brown water-like rotten plant, seedlings like boiling water like the same, dark green. Late onset, the incidence of seedlings often fall into pieces seedlings died. Germs spread with rain or irrigation water. The disease at 24 ℃ below the temperature and seedbed humidity is easy to disease; poor drainage and excessive rainfall, beneficial disease. Effective defense