玄参,又名元参、黑参等,为多年生草本药用植物。玄参病虫害比较多,现将常见的5种病虫害防治方法介绍如下。1.斑枯病每年4月开始发病,6~8月高温高湿发病严重。通常下部叶片先发病,逐渐蔓延到全株。发病初期,叶面呈紫褐色小点,中心微陷,后扩大成三角形、圆形或多角形,大型病斑呈灰白色,边缘有紫褐色角状突出的宽环,严重 Scrophulariaceae, also known as ginseng, black ginseng, perennial herbs for medicinal plants. Scrophulariaceae diseases and insect pests are more common now five kinds of pest control methods are described below. 1 spot blight onset in April each year, 6 to August the incidence of high temperature and humidity. Lower leaves are usually the first disease, gradually spread to the whole plant. Early onset, the leaves were purple brown dots, the center subsidence, enlarged into a triangle, rounded or polygonal, large lesions were gray, purple brown horny edge prominent wide ring, serious