蔬菜幼苗猝倒病俗称“卡脖子”、“小脚瘟”等。我镇近两年均有发生 ,是早春蔬菜育苗时苗床上为害最重的病害。发病后常造成幼苗成片死亡 ,称之为“掉苗”,重者甚至毁床 ,给蔬菜生产带来严重的影响。1　猝倒病症状病苗在茎基部初呈水浸状 ,黄褐色病斑 ,迅速扩展后病部缢缩成线 Vegetable seedling damping off disease commonly known as “card neck”, “small foot plague” and so on. My town has occurred in recent years, is the most harmful diseases in seedling bed nursery vegetables in early spring. Often caused after the onset of seedlings into pieces died, called “drop seedlings”, even those who destroy the bed, to vegetable production have a serious impact. 1 cataplexy sick disease seedlings in the beginning of the basal stem was flooded, brown spots, rapid expansion of the Department of disease after shrinking into a line