板兰根是一种半年收中药材，栽培生产具有投资少，见效快，易管理等特点。随着中药材价格不断提高，农民比较喜欢发展。但七。果栽培管理措施不当，极易产生病虫危害。1．霜霉病病原是真菌中一种藻状菌，危害叶部。发病初期病叶背面产生白色雾状物，无明显病斑和症状。随着病情 Banlangen is a medicine collected in half a year, cultivation and production with less investment, quick, easy to manage and so on. With the continuous improvement of Chinese herbal medicine prices, farmers prefer to develop. But seven. Improper fruit cultivation and management measures can easily cause pests and diseases. 1. Downy mildew pathogen is a fungus algae bacteria, endangering the leaves. The incidence of disease leaves the back of the white mist, no obvious lesions and symptoms. With the condition