水稻实行旱育稀植以后,立枯病已成为苗期的主要病害。从阿城水稻产区调查,苗床立枯病每年都有不同程度的发生,特别是在三叶一心期前后发病严重,叶片表现黄枯、青枯、根部变褐,根毛稀少或无根毛,苗床中间部分成簇成片枯死,死苗率在5～50%之间,严重时整床死亡。阿城地区前几年防治水稻苗床立枯病的用药主要是敌克松,最近两年开始采用生根粉、立枯灵、克枯星等药剂,有些农药有较好的预防效果,但是,一旦发病后,就很 After the implementation of dry and rain cultivation of rice, the blight has become the main disease at seedling stage. From the investigation of rice producing area in Acheng, the bed blight occurs to varying degrees every year, especially before and after the period of clover, the leaves show yellowish yellow, withered roots, brown roots, rare or no root hairs, The middle part of the cluster into pieces die, dead seedlings rate of 5 to 50%, the whole bed died in serious cases. A few years ago, the prevention and treatment of rice seedling blight in the city of acupuncture drug is mainly the main enemy Nixon, the last two years, the use of rooting powder, legislature Ling, grams of kudzu and other agents, some pesticides have a better preventive effect, but once After the onset, it is very