Abstract:Toxicity of seven insecticides to the white grub, Holotrichia parallela, was determined with insect-dipping test, and toxicity of seven insecticides to adults of H.parallela was also determined using insect-dipping test, glass-vial bioassay and leaf-dipping method to select effective insecticide, and field experiment was done at the same time. The result showed that the highest toxicity to the adult belong to cyhalothrin in insect-dipping treatment, phoxim with leaf-dipping method, and chlorpyrifos with glass-vial bioassay. Toxicity of cyhalothrin was significantly changed in different methods, and the relative virulence multiples of cyhalothrin with insect-dipping test was 61.86 times to that of leaf-dipping; chlorantraniliprole and fipronil had no significant change, but they had the lowest toxicities in every bioassay test. Carbosulfan had the highest toxicity to the white grub, and the LC50 was 7.29 mg/L. The field experiment showed, in the seven different pesticides, the control effect against white grub was 80.66% when using 35% phoxim microcapsule suspension 4 500 g/hm2, the protection effect on peanut was 77.90%, the yield of peanut was increased by 17.56%. There were no significant difference compared with that of 30% chlorpyrifos aqueous capsule suspension 2 250 g/hm2 and 20% carbosulfan emulsifiable concentrate 3 000 g/hm2, but significantly higher than other pesticides. In the middle of July, one of the three inse- cticides can be chosen as the ideal pesticide against H.parallela in peanut field.