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地老虎的发生场所比较复杂,卵和低龄幼虫不易发现,常使防治失误,因此对下面几种情况应特别注意。1.为害状:幼虫为害幼苗除造成“针孔状花叶”和“切茎”外,对较大的玉米、高粱幼苗,常在茎基紧靠地面处咬一椭圆形孔,有时白天栖息在内或沿茎内上行从心叶中爬出,被害苗既不倒折也不萎蔫,但生长受到抑制。黄地老虎为害春谷幼苗也常造成类似症状,但被害苗心叶往往萎蔫呈枯心苗,与粟灰螟为害造成枯心苗的区别是被害孔大,孔的边缘不整齐。为害棉花时,如幼苗
To place the tiger is more complex, eggs and young larvae difficult to find, often make mistakes, so the following situations should pay special attention. 1 damage: larvae damage seedlings in addition to the formation of “pinhole-like mosaic” and “cut stem”, the larger corn, sorghum seedlings, often close to the base of the stem bite an oval hole, sometimes during the day habitat In or along the stem upward ascending from the heart, the victim seedlings neither collapse nor wilting, but growth was inhibited. Huangdi tiger damage to the spring seedlings often cause similar symptoms, but the victim heart leaves tend to wilt was withered seedlings, caused by the damage caused by the corn borer borer seedlings is the difference between the victim hole, the edge of the hole is not neat. Cotton damage, such as seedlings