常用新型除草剂防除直播晚稻抗药性稗草药效现状及治理对策

目的]比较常用新型除草剂防除直播晚稻抗药性稗草的效果.方法]选择常用新型茎叶除草剂及组合用药,在播后苗前实施了封闭控草的直播晚稻田间稻苗3叶期,进行茎叶喷施防除抗药性稗草示范试验.结果]参试药剂对稗草具有很高的株防效、鲜重防效,但药后田间残存稗草仍能对水稻造成危害:10％口恶唑酰草胺EC 100～130 mL/6...

Current Status of Pesticide Efficacy and Control Strategy of Herbicides against Resistant Barnyardgrass in Directseeded Late Rice Field

Objective]Comparison of the effect on common new herbicides against resistant barnyardgrass in direct seeding late rice field.Methods]Using new stem and leaf herbicides and their combinations,in directseeded late rice fields where closed weed control was implemented after sowing and before emergence,a demonstration experiment of spraying stems and leaves to control resistant barnyardgrass was carried out at the threeleaf stage of rice seedlings.Results]The results showed that,the tested herbicides had high control effect on barnyardgrass,but the residue barnyardgrass in field can still cause harm to rice.After using these herbicides and combinations,such as:10%metamifop EC with the dosage of 100 mL/667m² to130 mL/667m²,10%metamifop-cyhalofopbutyl EC with the dosage of 200 mL/667m²,the combination of 13%cyhalofopbutyl-benzyl EC(80 mL/667m²)and 10%cyhalofopbutyl EC(120~150 mL/667m²),the combination of 3%florpyrauxifenbenzyl EC(100 mL/667m²)or 13%cyhalofopbutyl-benzyl EC(80 mL/667m²)and 6.9%fenoxapropethyl EW(20 mL/667m²),10%cyhalofopbutyl EW 160 mL/667m²,the residual barnyardgrass cause mild to moderate harm to rice.While using these herbicides and combinations(10%metamifop-cyhalofopbutyl EC(160 mL/667m²),13%cyhalofopbutyl-benzyl EC(80 mL/667m²)+10%cyhalofopbutyl EC(100 mL/667m²),the residual barnyardgrass cause moderate harm to rice.After using 10%bispyribacsodium SC(50 mL/667m²),34%propanil EC or 70%propanil-butachlor EC(180 mL/667m²),the residual barnyardgrass causes serious harm to rice.10%metamifop EC(160 mL/667m²),3%cyhalofopbutyl-benzyl EC(100 mL/667m²)+10%cyhalofopbutyl EC 100 mL/667m² and 10%cyhalofopbutyl EW(200 mL/667m²)showed higher safety to rice.Conclusion]we put forward the technical guidance for control of resistant barnyardgrass in direct seeding late rice field,and provide the control strategy of resistant barnyardgrass in direct seeding late rice field.