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高温天气容易导致中药材板蓝根发生霜霉病、根腐病和菌核病三种病害。有些药农不懂得识别与防治,往往束手无策,导致板蓝根减产甚至绝收。根据生产经验,现将板蓝根的病害症状及防治方法介绍如下:一、霜霉病1.症状为害叶部。植株下部靠近地面的叶片先发病,逐渐向上部叶片蔓延。发病初期仅叶背出现灰白色霜霉状物,叶片无明显病斑,被害部分凹凸不平,进一步发展则成绿色小圆斑,以后变为褐色枯斑,严重时褐色枯斑连
Hot weather easily lead to Chinese medicine Banlangen downy mildew, root rot and sclerotinia three diseases. Some drug farmers do not know how to identify and control, often do nothing, leading to Banlangen even cut even more yield. According to production experience, now the symptoms and prevention and treatment of Banlangen are as follows: First, downy mildew 1. Symptoms damage leaves. The lower part of the plant near the ground leaves first onset, gradually spread to the upper leaves. In the early stage of disease, gray-white downy mildew appeared only on the back of leaves, with no obvious lesions on the leaves and uneven parts of the victim. On the other hand, it became a greenish small roundish spot and later became a brownish spot. In severe cases,