韭菜灰霉病又称白色斑点病,是冬春扣棚韭菜的主要病害。近两年,此病在辽宁锦州、大连,河北省唐山及北京、天津近郊发生严重。给当前中小棚韭菜生产造成很大损失。由于此病流行,丰润县北关很多菜农被迫改茬毁种,新区刘庄子菜队群众对此病感到头痛。为解决这一生产问题,1984—1985年我们对此病进行了大面积调查和小面积试验,现把结果报道如下: 症状韭菜灰霉病主要症状有两种:第一,叶正面或叶背面最初生成浅灰褐或白色小斑点,由叶尖向下发展,斑点扩大后成椭圆形或棱形,病斑相互融合成大片,致使韭叶干枯。湿度大时,表面密生灰褐色霉层。第二种症状,病叶有时不产生白点,由收获刀口向下腐烂,腐烂部位初为水浸状,以后呈污绿色,并有褐色轮纹。此病一般在春节后第二刀韭菜发生严 Leek botrytis, also known as white spot disease, is the main disease in spring and winter cloak shed leeks. The past two years, the disease in Liaoning Jinzhou, Dalian, Hebei Province, Tangshan and Beijing, Tianjin suburbs serious. To the current shed shed lettuce caused a great loss. Due to the epidemic, many vegetable farmers in Beiluan, Fengrun County were forced to change their breeds and the masses in the Liuzhuang sub-park in the new district felt headaches. To solve this production problem, 1984-1985 we conducted a large area survey of the disease and a small area test, the results are reported as follows: Symptoms There are two main symptoms of chives Botrytis cinerea First, the leaf front or leaf back The initial generation of light gray or white small spots, the downward development of the tip, the spots expanded into an oval or prism, spot fusion with each other into large, resulting in dry leaves leek. Humidity, surface gray-brown moldy layer. The second symptom, the diseased leaves sometimes do not produce white spots, rotting downwards from the harvested blade, rotting parts of the beginning of the flooding, later was foul green, and brown round pattern. The disease is generally the second knife after the Spring Festival leek strict occurrence