Experiments on controlling cabbage butterfly (Pieris rapae L.) with 2.5% high efficiency cyhalothrin microemulsion

The experiments were carried out for measuring the effect of 2.5% high efficiency cyhalothrin microemulsion on controlling cabbage butterfly(Pieris rapae L.) in the field.The results showed that 2.5% high efficiency cyhalothrin microemulsion had a good effect on controlling the pest.The control effect was above 95% for seven days after spayed with 300～600ml/hm~2[KG*4]2.5% cyhalothrin microemulsion to cabbage butterfly,which was much better than that of applying 2.5% high efficiency cypermethrin.