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调查结果表明 :1 GK1 9对 3代棉铃虫抗性极强 ,生产上不需喷药可将棉铃虫控制在防治指标以下 ;2 GK1 9对 4代棉铃虫也具强抗性 ,5代抗性则较 3、 4代减弱 ,虽然 GK1 9后期对棉铃虫抗性有所下降 ,但在棉铃虫大发生年份 ,仅需喷药防治 2～ 3次 ,可将棉铃虫控制在防治指标以下
The results showed that: 1 GK1 9 is extremely resistant to the 3rd generation cotton bollworm and can be controlled below the control index without spraying; 2 GK1 9 also has strong resistance to 4th generation cotton bollworm and generation 5 Although the resistance of H. armigera to GK19 decreased in the later stage, the control of bollworm could be controlled below the control index