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板蓝根为十字花科植物菘蓝,以干燥的根、叶入药,有清热解毒、凉血的功效。在栽培过程中病害较多,常见病害有以下几种:一、板蓝根霜霉病1.症状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,叶面无明显病斑。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,严重时褐色枯斑连成大斑,病叶边缘亦变褐干枯,直至整个叶片干枯死亡。2.防治措施(1)收获时清除病
Banlangen is a cruciferous plant purplish blue to dry roots and leaves into medicine, there Qingrejiedu, cooling effect. In the cultivation process more diseases, common diseases are the following: First, the blueberry downy mildew 1. Symptoms lower leaves near the ground in the first disease, and gradually spread to the upper leaves. The early onset of gray-white creamy leaves appear only the back, no obvious lesions on the leaves. The part of the victims was bumpy and further developed into a small greenish spot. After that, it became a brown spot. In severe cases, the brown spot became a big spot and the edge of the diseased leaves turned brown and dry until the entire leaves died. 2. Control measures (1) clear the disease at harvest