芹菜斑枯病又叫晚疫病、叶枯病,俗称“火龙病”,是影响秋冬季保护地芹菜栽培的重要病害。在冷凉、湿度大、排水不良、窝风缺肥的地块,芹菜斑枯病发病就早而重。该病主要危害叶片。先从老叶发病,渐向新叶蔓延,初期产生油浸状淡褐色圆形病斑,边缘明显。继而变为褐色,叶上面散生小黑点,严重时全叶变褐色且干枯。叶柄和茎上产生褐色长圆形稍凹陷的柄斑 Celery blight known as late blight, leaf blight, commonly known as “dragon”, is an important fall and winter protected celery cultivation of important diseases. In the cold, humidity, poor drainage, nest lack of fertilizer plots, cephalosporins morbidity early and heavier. The disease harms the leaves. The first disease from the old leaves, gradually spread to the new leaves, the initial oil-like light brown round spots, the edge obvious. Then turned brown, scattered above the leaves of small black spots, severe brown leaves and dry leaves. Petiole and stem produce brown oval slightly depressed handle spot