猝倒病系针叶树种苗期的严重病害。其发病症状共有4种类型,其中以种芽在土内腐烂及幼苗猝倒2种类型对育苗造成的损失最大。引起幼苗猝倒的几种主要致病菌,如丝核菌、镰刀菌、交链孢菌等均系土壤中的习居菌,它们在土壤中分布极广,因此,土壤即为该病发生的主要侵染来源。为了保证育苗任务的完成,除合理的采用农业技 Damp down disease coniferous seedlings of the serious diseases. There are four types of symptoms, of which two kinds of seed germination and seedling catching decoction in the soil caused the biggest damage to the nursery. Several main pathogens causing seedling cataplexy, such as Rhizoctonia solani, Fusarium, and other strains of Alternaria are habitats in the soil, they are widely distributed in the soil, so the soil is the occurrence of the disease The main source of infection. In order to ensure the completion of nursery mission, in addition to the rational use of agricultural technology