大葱是我国主要蔬菜栽培作物之一。近年由于种植面积的扩大，大葱常发病害菌源的增多和品种抗性研究的不足等原因，普遍因受病害的危害而减产，造成品质下降和经济效益下滑。为避免或尽量减少常见病害的危害，应着重抓好选用抗病品种、做好种子处理、加强栽培措施和发病初期的 Welsh onion is one of the main vegetables cultivated in our country. In recent years, due to the expansion of planting area, the frequent occurrence of pathogenic bacteria and the lack of research on variety resistance, the yield reduction and the economic benefit decline generally due to the damage of the disease. In order to avoid or minimize the hazards of common diseases, emphasis should be placed on choosing resistant varieties, doing seed treatment, strengthening cultivation measures and early stages of disease