苗木立枯病是苗木在幼苗阶段发生的一种常见病害,发生范围广,发病率一般达20%—50%,有时高达80%,是苗圃中比较严重的病害之一。立枯病的症状分为种芽腐烂型、幼苗猝倒型、茎叶腐烂型和幼苗根腐型四种类型。其中危害较严重的是种芽腐烂型和幼苗猝倒型。在苗木繁育中如预防不利,往往造成幼苗大面积死亡。导致苗木立枯病发生的原因有两种,一种是非生物性病原,一种是生物性病原。非生物性病原主要是在育苗时由于苗圃地选择不当、管理不佳及气候条件不良等土壤条件和气候条件所引起。例如苗圃地积水、土壤板结、土壤温度或气温过高、日灼病的发生等;生物性病原 Seedling blight is seedling in the seedling stage of a common disease occurred in a wide range of incidence of 20% -50%, and sometimes as high as 80%, is one of the more serious nursery diseases. The symptoms of blight are divided into four types: seed germ decay type, seedling cataplexy type, stem-leaf decay type and seedling root rot type. Which is more serious damage is bud rot and seedling cataplexy type. Prevention of seedling breeding as unfavorable, often resulting in large-scale death of seedlings. There are two reasons for the emergence of seedling blight, one is a non-biological pathogen, one is a biological pathogen. Non-biological pathogens are mainly caused by soil conditions and climatic conditions such as improper nursery selection, poor management and poor climatic conditions during nursery. Such as nursery water, soil compaction, soil temperature or temperature is too high, the occurrence of sunburn, etc .; biological pathogens