Control Effects of Different Insecticides on Grub

The control effects of different concentrations and different forms of phoxim and chlorpyrifos on grub were studied in soybean field.The results showed that the control effects of 30% phoxim CS 15 000 g/hm2,30% chlorpyrifos CS 7 500 g/hm2,40% phoxim EC 15 000 g/hm2 and 48% chlorpyrifos EC 7 500 g/hm2 was 88.67%,70.00%,17.33% and 2.67%,respectively.The control effect of capsule suspension was significantly higher than that of emulsifiable concentrate.The yield of soybean with capsule suspension was significantly higher than that with emulsifiable concentrate.The persistent period of 30% phoxim CS reached more than 90 days,which was ideal agent for controlling grub.