本刊第二期介绍了地黄的叶部主要病害及其防治,现再介绍两种地黄根茎部的主要病害及其防治。地黄茎枯病:地黄茎枯病是为害地黄茎基部的一种病害,对生产威胁较大,往往引起地上部份成片死亡,造成严重减产。本病是由Fusarium Solani(Mart.)Sacc.F.Jentricoaum App.et Wr.引起的一种重要病害。初期在叶柄出现水浸状的病斑,边界不明显,由外缘向内蔓延,并腐烂,茎基发病后腐烂呈黑褐色,叶片萎蔫,全株并由外到内逐渐枯死,地下根茎并不腐烂,有时根茎上部又可重新发芽,甚至抽 The second issue of Rehmannia introduced the main leaf diseases and prevention and treatment of Rehmannia, are introduced two Rehmannia rhizome main diseases and their prevention and treatment. Yellow yellow stem blight: Rehmannia sclerotiorum stem blight is a disease of the root of Rhizome pollen, a greater threat to the production, often cause the aerial parts of a piece of death, resulting in serious cuts. The disease is an important disease caused by Fusarium Solani (Mart.) Sacc. F. Zentricoaum App. Et Wr. In the early stage of the petiole appeared flooded lesions, the border is not obvious, from the outer edge of the inward spread, and decay, the stem base after the onset of decay was brownish brown, leaf wilting, the whole plant gradually withering from the outside to the root rhizome and Not rotten, and sometimes the top of the rhizome can germinate, or even pumping