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解答：1.Sumith 1 : 400 ; and DDVP 1 : 400 spraying are very effective.
杀螟松 1∶400 倍水和DDVP1∶400 倍水喷洒植株,药效均达90%以上.
2.The result of the same insecticide against different popution instar larva of Cnaphalocrocis medinalis were difference.
同一杀虫剂对不同地区的稻纵卷叶螟幼虫的防治效果有差异.
3.Eradicating and controlling caterpillars is the central task of this year's disaster - reduction work.
防治稻螟是今年农业减灾的中心任务.
4.The results showed that Trichogramma japonicum Ashmead was the dominant species in all these regions.
对江苏和安徽几个不同稻螟发生区螟卵寄生蜂的调查表明,稻螟赤眼蜂为优势种.
5.Originally the machine was a conventional vertical borer used for machining of train wheels.
原来机器是一个传统的垂直化螟用于加工火车车轮.
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