芝麻菜是云南省大理州特有的一种蔬菜，由于性味清凉可口，食用时有一股芝麻香味，深受人们喜爱。但由于霜霉病的发生，影响了芝麻菜的种植和质量，制约了经济效益的发挥。（－）症状此病发生在叶片上，初期是淡绿色或黄绿色小点，然后扩大为受叶脉限制的多角形或不规则形病斑 Arugula is a peculiar vegetable in Dali Prefecture of Yunnan Province. Because of its cool and delicious taste, it has a sesame flavor when consumed, which is deeply loved by people. However, due to downy mildew, affecting the cultivation and quality of arugula, restricted the economic benefits. (-) Symptoms The disease occurs on the leaves, initially in a light green or yellow-green dot and then expands to a polygonal or irregular lesion limited by the veins