3种生物防治技术对夏玉米害虫的防治效果

在夏玉米田,研究了撒施白僵菌、田间释放赤眼蜂和田间释放中红侧沟茧蜂3种生物防治技术对夏玉米主要害虫的防治效果。结果表明：田间释放赤眼蜂45万头/hm2防治玉米螟效果较好,田间释放中红侧沟茧蜂7 500头/hm2对棉铃虫有一定防效,而在玉米心叶期撒施白僵菌900 g/hm2对玉米螟和棉铃虫防效不明显。生产上采用田间释放赤眼蜂和中红侧沟茧蜂控制夏玉米虫害,具有方法简便、无农药残留、对害虫持续控制效果好等优点,可以在夏玉米田大面积推广。

Control Efficiency of Three Bio-control Technology on Pests in Summer Corn Field

The control efficiency of three different bio-control methods including spreading Beauveria bassiana,field releasing Trichoguamma ostrininae and field releasing Microplitis mediator were investigated in summer corn field.The results indicated that the field releasing of T.ostrininae at the rate of 450 000 wasps/ hm2 had better control effeciency on corn borer,and that of M.mediator at the rate of 7 500 wasps/hm2 had control efficiency on cotton bollworm.Spreading B.bassiana during corn heart stage had no significant control efficiency on corn borer and cotton bollworm.The field releasing of T.ostrininae and M.mediator was simple and sustainable,without pesticide residue,which could be extended in large areas.