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试验结果表明,6种药剂对菜青虫各龄幼虫均有较好的防效,可用于菜青虫的防治。虫口密度低时,可选择1.1%复方苦参素植物杀虫剂1 875g/hm~2,5%灭幼脲悬浮剂600g/hm~2,7.5%除虫·高氯悬浮剂600g/hm~2交替使用;虫口密度高时, 可使用40%辛硫磷乳油1 000g/hm~2或50%敌敌畏乳油1 300g/hm~2或5%氯氰菊酯乳油400g/hm~2。施药最佳时期为菜青虫3龄以前。
The test results show that the six kinds of agents have good control effect on the larvae of Pieris rapae and can be used for the prevention and control of Pieris rapae. Insect mouth density is low, you can choose 1.1% compound matrine plant insecticides 1 875g / hm ~ 2,5% dibufen suspension agent 600g / hm ~ 2, 7.5% insecticide / high chlorine suspension agent 600g / hm ~ 2 alternate use; pest population density can be used 40% phoxim 1 000g / hm ~ 2 or 50% of dichlorvos EC 1 300g / hm ~ 2 or 5% of cypermethrin EC 400g / hm ~ The best time for spraying is Pieris rapae before the third instar.