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三化螟为南方稻区主要害虫。尤其是第四代,在江西连年暴发,盛蛾期长,高峰多,发蛾量大,产卵多,为害面广,损失重。如兴国县1971年四代三化螟灯下蛾量73,527头,最盛日为13,322头,田间卵块密度5,140块/亩,晚稻白穗率达52.6％,全县因此损失晚稻376万斤。现将四代三化螟盛发时大量出现的卵块观察资料整理如下,以供参考。
Borer borer is the main pest in southern rice area. Especially the fourth generation, in successive years in Jiangxi outbreak, Sheng Moth period, peak and more, hair moths large, spawning more, a wide range of damage, heavy loss. For example, in Xingguo County, the number of moths in the four generations of the three generations in 1971 was 73,527, with the peak day of 13,322 heads. The egg density in the field was 5,140 blocks / mu. The rate of white spike in late rice reached 52.6%. Thus, the entire county lost 3.76 million tons of late rice. Now four generations of borer Sheng flourishing large number of egg observation data collated as follows, for reference.