The Control Efficiency of Five Insecticides to Holotrichia parallclaLarva in Peanut Field at Different Periods

Using peanut variety Jihua No.5 as test material,the control efficiency of 3% carbofuran granules 60 kg/hm2,3% phoxim granules 45 kg/hm2,15% chlorpyrifos granule 15 kg/hm2,20% chlorpyrifos microcapsule suspension agent 30 g/kg and 5% chlorantraniliprole suspending agent 2 mL/kg against grubs in peanut field were studied by toxic soil and dressing method.The results indicated that 5 insecticides showed good control effect to grubs in the peanut seedling stage,and with no significant differences between the treatments,the control effect ranged from 82.03% to 91.41%.The control efficiency of 20%chlorpyrifos microcapsule suspension agent(85.08%)was highest,that of 15% chlorpyrifos granule and 5% chlorantraniliprole suspending agent respectively were 81.05% and 80.57%,the differences of three were not significant and the lowest was 3% phoxim granules,which the control efficiency was only 58.11%,and was significantly less than that of others.The yields of peanut with five insecticides were significantly increased by 10.00%~24.51% than that of CK,the yield with 20% microcapsule suspension was highest,which was 3 494.50 kg/hm2,that of 15% chlorpyrifos granule and 5% chlorantraniliprole suspending agent respectively were 3 397.02 kg/hm2 and 3 339.23 kg/hm2,and the difference was not sigrificant among them.Chlorpyrifos and chlorantraniliprole could be used to instead of carbofuran and phoxim against grubs in peanut field.