现在正是保护地蔬菜育苗的季节，培育无病健壮的幼苗是获得丰收的基础，而防治苗期病害是保证培育壮苗的关键措施。１症状识别１．１猝倒病由病原真菌的腐霉菌引起，番茄、黄瓜、甜椒、茄子、莴苣等蔬菜幼苗发病多发生在育苗床上，出土前染病可造成烂种、烂芽；出土后幼苗受害 Now it is the season of vegetable nursery in protected areas. Cultivating disease-free and robust seedlings is the basis for obtaining good harvests. Prevention and treatment of seedling diseases is the key measure to ensure nurturing strong seedlings. 1 Symptoms identification 1.1 damping off disease caused by pathogenic fungi Pythium, tomato, cucumber, bell pepper, eggplant, lettuce and other vegetable seedlings incidence occurred in nursery bed, disease can cause pre-emergence of rotten, rotten buds; unearthed Seedlings suffer