摘要：To explore the co.trol efficacy of 85%pyroxasulfone water-dispersible granule(WG)on annual weeds in co.n field as well as its safety,a randomized block design was used to co.duct a field plot test of efficacy at four different test *** sowing before seedling,85%pyroxasulfone WG at the doses of 10,15,20,and 40 g/667 m^(2),and 55%acetochlor+atrazine suspension co.centrate(SC,co.trol agent)at the dose of 170 g/667 m^(2)in summer co.n area and 260 g/667 m^(2)in spring co.n area were applied,*** test site without herbicide application was used as the blank *** results revealed that after 40 d of application,the co.trol efficacy of 85%pyroxasulfone WG reached 83.75%~98.23%on Gramineae weeds,55.22%~98.33%on broadleaf weeds,and 88.03%~98.46%on Cyperaceae weeds,but without toxicity to *** with 55%acetochlor+atrazine SC,85%pyroxasulfone WG at the dose of more than 10 g/667 m^(2)had higher co.trol efficacy on Gramineae weeds,lower efficacy on broadleaf weeds and similar efficacy on Cyperaceae *** sum up,spraying 85%pyroxasulfone WG at the dose of 15~20 g/667 m^(2)(an active co.ponent dose of 191.3~255.0 g/hm^(2))after sowing before seedling co.ld effectively co.trol some annual weeds in co.n fields and had no toxicity to *** herbicide dose was greatly reduced,and thus 85%pyroxasulfone WG was reco.mended as an effective mean to co.trol the main weeds in co.n fields.