【摘 要】
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大搞土农藥,它兼具了种类多,来源易,制作方便,成本低等特点,对某些虫害防治效能显著,保証了生产,应广泛推广。各种土农藥所含的成分不同对于不同种类之昆虫杀伤力也有差別,
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2011年5月31日,天津市和平区岳阳道小学、逸阳梅江湾国际学校在天津大礼堂召开了“庆’六一’,’红领巾心向党’红诗、红歌诵读演唱会”。
May 31, 2011, Yueyang Road, Hep
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四、摘要1.哈尔滨地区粘虫本年发生两个世代,以第一代发生数量较多,并在6月上、中旬形成发蛾高峰,为害严重。2.粘虫的寄主计有7科20种,小麦、高粱、谷子、玉米等禾本科作物为
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