选用田间常见的6种植物,用蒸馏水对其进行浸提,经旋转蒸发仪浓缩得到植物提取物。大多数提取物对非洲菊疫病病菌菌丝生长都有不同程度的抑制作用,其中白蒿提取物对菌丝生长抑制效果最好,抑制率达91.46%,桉树、青蒿次之,抑制率分别为70.00%、62.20%,紫茎泽兰、芹菜抑制效果较差,分别为31.77%、3.43%,而蛇床子无抑制效果。根据菌丝生长抑制试验和离体抑菌试验结果,选取抑制效果较好的3种植物提取物用于非洲菊疫病的田间防治试验,结果表明青蒿、桉树的植物提取物对非洲菊疫病的田间相对防治效果分别为86.58%、65.92%,可用于新型植物农药的开发利用。 Six kinds of plants commonly used in the field were selected, leached with distilled water, and concentrated by rotary evaporator to obtain plant extracts. Most of the extracts had different degrees of inhibition on the mycelium growth of the germs of Alternaria alternata, of which the extracts of Artemisia annua L. had the best inhibitory effect on mycelium growth with the inhibition rate of 91.46%, followed by Eucalyptus and Artemisia annua, respectively 70.00%, 62.20%. The inhibitory effects of Eupatorium adenophorum and Celery were poor, which were 31.77% and 3.43%, respectively. However, Cnidium monnieri had no inhibitory effect. According to mycelial growth inhibition test and in vitro antibacterial test results, three plant extracts with better inhibition effect were selected for the field control experiment of gerbera blight. The results showed that plant extracts of Artemisia annua L. and Eucalyptus had significant effects on the germination of the gerbera The relative control effects in the field were 86.58% and 65.92% respectively, which could be used for the development and utilization of new plant pesticides.