不同除草剂防除单季直播稻田抗药性杂草的效果

Effects of different herbicides on the control of resistant weeds in one-season direct seeding rice field

选用13%氰氟·吡啶酯乳油等新型茎叶除草剂及其组合用药,在单季直播稻田稻苗3叶期进行茎、叶喷施防除抗药性杂草示范试验。结果表明,13%氰氟·吡啶酯乳油80 mL/667 m^(2)+10%氰氟草酯乳油100~150 mL/667 m^(2)组合施用,对直播稻田抗药性稗草、千金子及其他杂草具有较理想的防除效果;10%恶唑酰草胺乳油160 mL/667 m^(2)足液喷施,对直播稻田抗药性稗草、千金子防除效果理想;10%恶唑·氰氟乳油170~200 mL/667 m^(2),对抗药性稗草、千金子、鸭舌草等阔叶杂草、异型莎草等莎草科杂草的防除效果稍差。药后13 d,参试药剂各处理对稗草的株防效为96.8%~98.8%、对总草的株防效为85.0%~98.0%;药后30 d,参试药剂各处理对稗草的株防效高达97.2%~99.0%、鲜重防效高达95.4%~99.5%,对总草的株防效高达94.1%~98.1%、鲜重防效高达94.6%~99.2%,但田间残留稗草仍能造成危害。提出了直播稻田抗药性稗草防除控草对策。

A demonstration experiment on control of resistant weeds by stem and leaf spraying was carried out in direct-seeding rice fields at 3-leaf stage using 13%cyhalofop-butyl.benzyl EC and heir combinations.The results showed that the combined application of 13%cyhalofop-butyl.benzyl EC 80 mL/667 m^(2)+10%cyhalofop-butyl EC 100~150 mL/667 m^(2) had ideal control effect on the resistance of Echinochloa crusgalli(L.)Beauv.,Leptochloa chinensis(L.)Nees and other weeds in direct seeding rice fields;The control effect spraying with 10%metamifop EC 160 mL/667 m^(2) is ideal for resistant Echinochloa crusgalli(L.)Beauv.,Leptochloa chinensis(L.)Nees in direct seeding rice field;The control effect spraying with 10%metamifop.cyhalofop-butyl EC 170~200 mL/667 m^(2) is not very ideal for resistant Echinochloa crusgalli(L.)Beauv.,Leptochloa chinensis(L.)Nees,broad-leaved weeds,such as Monochoria vaginalis(Burm.f.),and Cyperaceae weeds such as Cyperus difformis L.On the 13 th day after spraying herbicides,the plant control effect of each treatment on barnyard grass was 96.8%~98.8%,and 85.0%~98.0%on total grass.On the 30 th day after spraying herbicides,the control effect of each agent on the plant and fresh weight of barnyard grass was 97.2%~99.0%,95.4%~99.5%,94.1%~98.1%and 94.6%~99.2%,but the residual barnyard grass could still cause harm in the field.The control strategy of resistant barnyard grass was put forward.