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冬季温度低,蔬菜大棚内通风不良、光照不足,幼苗抵抗力较弱,在育苗过程中如果管理不当,极易出现猝倒病、立枯病和地下害虫。幼苗受害后,轻则秧苗不同程度受损,壮苗减少,不能满足生产所需;重则造成幼苗大量死亡,延误农时,给蔬菜生产带来重大损失。所以,抓好蔬菜苗期病害及地下害虫的防治是夺取蔬菜丰产丰收的基础。主要病虫害主要病害幼苗生长的前期容易发生猝倒病,如遇到低温阴雨或寒流天气,冷风侵入苗床,有利于该病的发生
Low winter temperatures, poor ventilation in vegetable greenhouses, inadequate lighting, seedling resistance is weak, in the nursery process if not properly managed, prone to damping-off disease, blight and underground pests. Seedling victims, ranging from different degrees of damage to seedlings, strong seedlings reduce, can not meet the production needs; heavy cause seedlings died in large quantities, delay farming, vegetable production to bring significant losses. Therefore, to do a good job of vegetable seedling diseases and prevention and control of underground pests is to seize the basis of high yield and good harvest of vegetables. The main diseases and insect pests Main diseases Early seedling growth prone to damping-off disease, such as the case of cold rain or cold weather, cold wind invaded seedbed, is conducive to the occurrence of the disease