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一 一个新问题 螟虫是我国中、南部稻区内水稻生产上的大敌。解放以后,在党的领导下,大力开展防治,取得巨大的成绩。但是,近年来,随着农业生产的不断发展,螟虫发生情况有所改变。由于各地绿肥留种田和麦田的栽培面积,有不同程度的扩大,增加了一年中螟虫发生的基数;同时,双季稻栽培面积也不断扩大,使水稻栽培制度复杂化,有利于螟
A new problem stem borer is the enemy of rice production in the rice fields in central and southern China. After the liberation, under the leadership of the party, vigorously carried out prevention and control and achieved tremendous achievements. However, with the continuous development of agricultural production in recent years, the occurrence of stem borers has changed. As the area of cultivation of green manure and wheat fields around each area expanded to different extents, the base number of stem borers increased by one year. Meanwhile, the cultivation area of double cropping rice also expanded continuously, which made the rice cultivation system more complicated,