蔬菜苗期病害种类多，发病原因也十分复杂，育苗过程中稍不注意，就会造成大量死苗、缺苗。为此，当切实把好以下“四关”： 一是种子处理关。菌核病的菌核一般混杂在种子里，应通过水洗、风选或筛选等方法进行清除，种子先用冷水预浸３个小时，再用５５℃热水浸种１５－３０分 Vegetable seedling disease types, the cause is also very complicated, nursery process a little careless, it will result in a large number of dead seedlings, lack of seedlings. To this end, when the following “four customs” should be effectively handled: First, the seeds should be handled. Sclerotinia sclerotia generally mixed in the seeds, should be washed, wind selection or screening and other methods to remove seed pre-soaked with cold water for 3 hours, then 55 ℃ hot soaking 15-30 points